summon vs muster

summon is not a noun while muster is a noun.

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

As verbs, summon and muster are synonyms defined as:

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

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

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