commander vs serviceman

commander and serviceman both are nouns.

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

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

commander: an officer in the airforce
serviceman: someone who serves in the armed forces; a member of a military force

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

commander (noun)	serviceman (noun)
an officer in command of a military unit	someone who serves in the armed forces; a member of a military force
a commissioned naval officer who ranks above a lieutenant commander and below a captain
an officer in the airforce
someone in an official position of authority who can command or control others