invite vs ask round

invite is a noun but ask round is not a noun.

Word	Noun	Adjective	Verb	Adverb
invite	Yes	No	Yes	No
ask round	No	No	Yes	No

As verbs, invite and ask round are synonyms defined as:

Other synonyms of invite include ask over.

invite (noun)	ask round (noun)
a colloquial expression for invitation

invite (verb)	ask round (verb)
ask someone in a friendly way to do something	invite someone to one's house
request the participation or presence of
ask to enter
express willingness to have in one's home or environs
give rise to a desire by being attractive or inviting
increase the likelihood of
invite someone to one's house
have as a guest