duty tour vs enlistment

duty tour and enlistment both are nouns.

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

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

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

duty tour (noun)	enlistment (noun)
a period of time spent in military service	the act of enlisting (as in a military service)
	a period of time spent in military service