According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 247 words with the pattern S-A--. That is, five letter words with 1st letter S and 3rd letter A. In alphabetical order, they are:

scabs

scads

scaff

scags

scail

scala

scald

scale

scall

scalp

scaly

scamp

scams

scand

scans

scant

scapa

scape

scapi

scare

scarf

scarp

scars

scart

scary

scath

scats

scatt

scaud

scaup

scaur

scaws

sdayn

seals

seame

seams

seamy

seans

seare

sears

sease

seats

seaze

shack

shade

shads

shady

shaft

shags

shahs

shake

shako

shakt

shaky

shale

shall

shalm

shalt

shaly

shama

shame

shams

shand

shank

shans

shape

shaps

shard

share

shark

sharn

sharp

shash

shaul

shave

shawl

shawm

shawn

shaws

shaya

shays

sials

skags

skail

skald

skank

skart

skate

skats

skatt

skaws

slabs

slack

slade

slaes

slags

slaid

slain

slake

slams

slane

slang

slank

slant

slaps

slart

slash

slate

slats

slaty

slave

slaws

slays

smaak

smack

smaik

small

smalm

smalt

smarm

smart

smash

smaze

snabs

snack

snafu

snags

snail

snake

snaky

snaps

snare

snarf

snark

snarl

snars

snary

snash

snath

snaws

soaks

soaps

soapy

soare

soars

soave

space

spacy

spade

spado

spaed

spaer

spaes

spags

spahi

spail

spain

spait

spake

spald

spale

spall

spalt

spams

spane

spang

spank

spans

spard

spare

spark

spars

spart

spasm

spate

spats

spaul

spawl

spawn

spaws

spayd

spays

spaza

spazz

stabs

stack

stade

staff

stage

stags

stagy

staid

staig

stain

stair

stake

stale

stalk

stall

stamp

stand

stane

stang

stank

staph

staps

stare

stark

starn

starr

stars

start

stash

state

stats

staun

stave

staws

stays

suave

swabs

swack

swads

swage

swags

swail

swain

swale

swaly

swami

swamp

swamy

swang

swank

swans

swaps

swapt

sward

sware

swarf

swarm

swart

swash

swath

swats

swayl

sways