summon vs buzz

summon is not a noun while buzz is a noun.

Word	Noun	Adjective	Verb	Adverb
summon	No	No	Yes	No
buzz	Yes	No	Yes	No

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

Other hyponyms of summon include page, convene, convoke, beckon.

summon (noun)	buzz (noun)
	a confusion of activity and gossip
	sound of rapid vibration

summon (verb)	buzz (verb)
make ready for action or use	call with a buzzer
call in an official matter, such as to attend court	fly low
ask to come	make a buzzing sound
gather or bring together	be noisy with activity
cause to become available for use, either literally or figuratively