regular army vs armed service

regular army and armed service both are nouns.

Word	Noun	Adjective	Verb	Adverb
regular army	Yes	No	No	No
armed service	Yes	No	No	No

As nouns, armed service is a hypernym of regular army; that is, armed service is a word with a broader meaning than regular army:

regular army: a permanent organization of the military land forces of a nation or state
armed service: a force that is a branch of the armed forces

Other hypernyms of regular army include military service, service.

regular army (noun)	armed service (noun)
a permanent organization of the military land forces of a nation or state	a force that is a branch of the armed forces