call vs muster

call and muster both are nouns.

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

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

Other hyponyms of call include cite, summon, summons, beep, call back, recall, call in, lift, hail, summon, call up, mobilise, mobilize, rally.

call (noun)	muster (noun)
(sports) the decision made by an umpire or referee	compulsory military service
a visit in an official or professional capacity	a gathering of military personnel for duty
a brief social visit
the option to buy a given stock (or stock index or commodity future) at a given price before a given date
a method of contacting a person by phone
a loud utterance; often in protest or opposition
the characteristic sound produced by a bird
a request
a demand
a demand for a show of hands in a card game
an instruction that interrupts the program being executed
a demand by a broker that a customer deposit enough to bring his margin up to the minimum requirement

call (verb)	muster (verb)
rouse somebody from sleep with a call	call to duty, military service, jury duty, etc.
challenge the sincerity or truthfulness of	gather or bring together
consider or regard as being
utter in a loud voice or announce
ascribe a quality to or give a name of a common noun that reflects a quality
get or try to get into communication (with someone) by telephone
assign a specified (usually proper) name to
utter a characteristic note or cry
send a message or attempt to reach someone by radio, phone, etc.; make a signal to in order to transmit a message
order, request, or command to come
indicate a decision in regard to
challenge (somebody) to make good on a statement; charge with or censure for an offense
declare in the capacity of an umpire or referee
utter a sudden loud cry
make a prediction about; tell in advance
lure by imitating the characteristic call of an animal
present for redemption before maturation
read aloud to check for omissions or absentees
order, summon, or request for a specific duty or activity, work, role
order or request or give a command for
give the calls (to the dancers) for a square dance
make a demand, as for a card or a suit or a show of hands
demand payment of (a loan)
pay a brief visit
call a meeting; invite or command to meet
make a stop in a harbour
greet, as with a prescribed form, title, or name
stop or postpone because of adverse conditions, such as bad weather