invitation vs missive

invitation and missive both are nouns.

Word	Noun	Adjective	Verb	Adverb
invitation	Yes	No	No	No
missive	Yes	No	No	No

As nouns, missive is a hypernym of invitation; that is, missive is a word with a broader meaning than invitation:

invitation: a request (spoken or written) to participate or be present or take part in something
missive: a written message addressed to a person or organization

Other hypernyms of invitation include letter, asking, request.

invitation (noun)	missive (noun)
a tempting allurement	a written message addressed to a person or organization
a request (spoken or written) to participate or be present or take part in something