muster vs summon

muster is a noun but summon is not a noun.

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

As verbs, muster and summon are synonyms defined as:

Other synonyms of muster include come up, muster up, rally.

muster (noun)	summon (noun)
compulsory military service
a gathering of military personnel for duty

muster (verb)	summon (verb)
call to duty, military service, jury duty, etc.	make ready for action or use
gather or bring together	call in an official matter, such as to attend court
	ask to come
	gather or bring together
	cause to become available for use, either literally or figuratively