semi vs semifinal

semi and semifinal both are nouns.

Word	Noun	Adjective	Verb	Adverb
semi	Yes	No	No	No
semifinal	Yes	No	No	No

As nouns, semi and semifinal are synonyms defined as:

semi and semifinal: one of the two competitions in the next to the last round of an elimination tournament

semi (noun)	semifinal (noun)
a trailer having wheels only in the rear; the front is supported by the towing vehicle	one of the two competitions in the next to the last round of an elimination tournament
a truck consisting of a tractor and trailer together
one of the two competitions in the next to the last round of an elimination tournament