The (polite) Four Letter Word Game

tare

eats

teas

tase

www.oxforddictionaries.com/definition/english/taser#taser__2 (the verb)

east

seat

sate

seta

test

zest

size

isle

sile

lies

pies

ties

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site

leis

(plural)
www.finedictionary.com/lei.html

oils

foil