tour of duty vs term of enlistment

tour of duty and term of enlistment both are nouns.

Word	Noun	Adjective	Verb	Adverb
tour of duty	Yes	No	No	No
term of enlistment	Yes	No	No	No

As nouns, tour of duty and term of enlistment are synonyms defined as:

tour of duty and term of enlistment: a period of time spent in military service

Other synonyms of tour of duty include duty tour, enlistment, hitch, tour.

tour of duty (noun)	term of enlistment (noun)
a period of time spent in military service	a period of time spent in military service