Here is a list of nouns that start with THI.
thiamin, thick, thicket, thief, thigh
thiihng, thimble, thing, thinker, thinking
thinning, thiouracil, third, thirst
Hope you enjoy this page of nouns that start with thi and the rest of this noun list a-z site as well.
Help make this a better resource by adding more nouns in the comments section. Thanks.