recognise vs hail

recognise is not a noun while hail is a noun.

Word	Noun	Adjective	Verb	Adverb
recognise	No	No	Yes	No
hail	Yes	No	Yes	No

As verbs, hail is a hyponym of recognise; that is, hail is a word with a more specific, narrower meaning than recognise:

Other hyponyms of recognise include shake hands, bob, curtsy, salute, present, salute, salute, herald, receive, welcome, say farewell, bid, wish.

recognise (noun)	hail (noun)
	enthusiastic greeting
	many objects thrown forcefully through the air
	precipitation of ice pellets when there are strong rising air currents

recognise (verb)	hail (verb)
perceive to be the same	greet enthusiastically or joyfully
be fully aware or cognizant of	call for
accept (someone) to be what is claimed or accept his power and authority	praise vociferously
express obligation, thanks, or gratitude for	be a native of
express greetings upon meeting someone	precipitate as small ice particles
detect with the senses
grant credentials to
show approval or appreciation of