6-Letter Word-Change one or two letters make a new word

I’ll assume you forgot an apostrophe.

Sparta

Ok you two, I’m running on 2 hours sleep. Are you trying to make me cry? Dang!

starts

racist

tarmac

tartan

No, don’t cry.

ration

tariff

Fritos

frosty

forest

sterol

stereo

unrest

strewn

invert

invent

venial

denial

landed

undead