enlist

verbs

join the military
enlist
is derived from
enlistment
is a type of (narrower)
join a club, an activity, etc. with the intention to join or participate, "Sign up for yoga classes"
sign up
hire for work or assistance
"engage aid, help, services, or support"
engage, enlist
engage somebody to enter the army
draft, enlist, muster in
is derived from
enlistment
is derived from
enlistee
is derived from
enlisting
antonym
discharge