veteran vs serviceman

veteran and serviceman both are nouns.

Word	Noun	Adjective	Verb	Adverb
veteran	Yes	Yes	No	No
serviceman	Yes	No	No	No

As nouns, serviceman is a hypernym of veteran; that is, serviceman is a word with a broader meaning than veteran:

veteran: a person who has served in the armed forces
serviceman: someone who serves in the armed forces; a member of a military force

Other hypernyms of veteran include man, military man, military personnel.

As nouns, serviceman is a hypernym of veteran; that is, serviceman is a word with a broader meaning than veteran:

veteran: a serviceman who has seen considerable active service
serviceman: someone who serves in the armed forces; a member of a military force

Other hypernyms of veteran include man, military man, military personnel.

veteran (noun)	serviceman (noun)
an experienced person who has been through many battles; someone who has given long service	someone who serves in the armed forces; a member of a military force
a person who has served in the armed forces
a serviceman who has seen considerable active service

veteran (adjective)	serviceman (adjective)
rendered competent through trial and experience