- ' savants ' ... sabring
- sabulose ... saccus
- sacella ... sacrum
- sacsoffon ... safon
- safon ... saiga
- saikyr ... salacity
- salad ... saliniferous
- saliniform ... salpinx
- salsafy ... salvability
- salvable ... san ffolant
- sanability ... sandnecker
- sandpiper ... sans
- sanscrit ... saponifying
- saponin ... sarcocele
- sarcocol ... sarhad
- sarhad ... sassanage
- sassarara ... satrapy
- saturable ... sauroidichnite
- sauropoda ... sawl
- sawl ... sbardun
- sbarduno ... scabwort
- scad ... scampish
- scandalize ... scaraboid
- scaramouch ... scavage
- scazon ... scherbet
- scherif ... scholiast
- scholiastic ... scimitar
- scimiter ... sclaundre
- sclav ... scoldingly
- scole ... scoriac
- scoriaceous ... scouse
- scouted ... scribbet
- scribblement ... scrouge
- scrow ... scummed
- scummer ... scybala
- scye ... seans arnoch
- seapiece ... secern
- secerned ... sectionalize
- sectionally ... seedbox
- seedcake ... sefydliadol
- sefydlog ... seicolegol
- seicolegydd ... seismology
- seismometer ... seleniureted
- seleniwm ... sembling
- seme ... semidiapente
- semidiaphaneity ... seminific
- seminification ... semisteel
- semita ... senecas
- senecio ... sensoria
- sensoriaeth ... sepaline
- sepalody ... septentrial
- septentrio ... sequacious
- sequaciousness ... serenely
- sereneness ... sero
- sero ... serrulation
- serry ... sesquisalt
- sesquisulphide ... setule
- setulose ... sextillion
- sexto ... sglein
- sglein ... sgwadron
- sgwâr ... shagbark
- shagebush ... shanker
- shannies ... sheatfish
- sheathbill ... sheldafle
- sheldaple ... sheth
- shette ... shinning
- shinplaster ... shockdog
- shoddyism ... shortcake
- shortclothes ... shriek
- shrieked ... shuffler
- shufflewing ... siaradus
- siaradus ... siciliano
- sicilienne ... siderographic
- siderographical ... sightful
- sigledig ... sik
- sike ... silicule
- siliculose ... silverbill
- silverboom ... simoon
- simous ... sinewiness
- sinewing ... sinoper
- sinopia ... siop
- siop flodau ... sipple
- sippling ... sismometer
- siss ... sizarship
- sizel ... skene
- skep ... skirmisher
- skirmishing ... skylarking
- skylight ... slatch
- slater ... slee
- sleeked ... slicken
- slickens ... slitter
- slive ... slub
- slubbed ... slype
- smala ... smilingness
- smilodon ... smouldered
- smoulderingness ... snarer
- snarler ... snipebill
- snipefish ... snowshoe
- snowshoeing ... sobriquet
- sobrwydd ... sodr
- sodro ... soland
- solander ... solenaceous
- soleness ... soling
- solipedous ... somewhen
- somewhile ... sonatina
- soncy ... soothness
- soothsay ... sorbile
- sorbin ... sors
- sortable ... soullessly
- soun ... southwester
- southwestward ... spadille
- spading ... sparadrap
- sparage ... spathed
- spathic ... speckledness
- speckling ... speiss
- spekboom ... spermatophore
- spermatophorous ... sphene
- sphenethmoid ... sphygmograph
- sphygmographic ... spile
- spilikin ... spirable
- spiracle ... spirt
- spirtle ... spleenwort
- spleeny ... spodomantic
- spodumene ... spook
- spoom ... spotter
- spottiness ... spritely
- spritsail ... sputter
- sputtered ... squamozygomatic
- squamulae ... squillitic
- squinance ... stade
- stadia ... staktometer
- stalactic ... stanch
- stanched ... staplwch
- staplwr ... statedly
- stateful ... stavesacre
- stavewood ... steeled
- steeler ... stelae
- stelcio ... stenographing
- stenographist ... stereography
- stereometer ... sternsman
- sternson ... stibnite
- stibonium ... stilettoing
- stilettos ... stipendiarian
- stipendiaries ... stoak
- stoc ... stomachal
- stomached ... stonish
- stont ... storm eira
- storm genllysg ... straighthorn
- straighting ... straticulate
- stratiform ... strenuity
- strepent ... striges
- strigil ... stromeyerite
- strond ... struntian
- struse ... stultified
- stultifier ... stut
- stutterer ... stypticity
- styracin ... subarachnoid
- subarachnoidal ... subcrystalline
- subcultrate ... subepithelial
- subequal ... subjectist
- subjectivism ... submedial
- submedian ... subordinative
- suborn ... subsannation
- subscapular ... substitutional
- substitutionary ... subtleness
- subtonic ... subvertible
- subvitalized ... succulous
- succumbent ... sufficing
- suffisance ... sugno
- sugno ... sulphantimonious
- sulphantimonite ... sulphury
- sulphuryl ... sundering
- sundial ... superannuating
- superbiate ... superficialize
- superficiary ... supermundane
- supermundial ... superscription
- supersecular ... supparasitation
- supparasite ... supprise
- suppurant ... suprasphenoidal
- supraspinal ... surement
- sureness ... surprisement
- surpriser ... suscipient
- suscitability ... sut mae'n cyfuno
- sutile ... swallowwort
- swang ... swcros
- sweal ... swiftlet
- swig ... swipper
- swirled ... swomorffig
- swonk ... swyno
- swynoglaidd ... sy'n dechrau
- sy'n deillio ... sy'n torri tir newydd
- sy'n twyllo'r ... sycophantish
- sycophantism ... syfrdanol
- syfrdanol ... syllogistically
- syllogization ... sylweddol
- sylweddol ... symleiddio
- symleiddio'r ... symud
- symud ... synchondroses
- synchondrosis ... synecdochical
- synecdochically ... synocil
- synod ... syphilization
- syphilize ... system
- system aerdymheru ... syzygy
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