semiformal vs semi-formal

semiformal and semi-formal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
semiformal	No	Yes	No	No
semi-formal	No	Yes	No	No

As adjectives, semiformal and semi-formal are synonyms defined as:

semiformal and semi-formal: moderately formal; requiring a dinner jacket

Other synonyms of semiformal include black-tie.

semiformal (adjective)	semi-formal (adjective)
moderately formal; requiring a dinner jacket	moderately formal; requiring a dinner jacket