pup tent vs shelter tent

pup tent and shelter tent both are nouns.

Word	Noun	Adjective	Verb	Adverb
pup tent	Yes	No	No	No
shelter tent	Yes	No	No	No

As nouns, pup tent and shelter tent are synonyms defined as:

pup tent and shelter tent: a wedge-shaped tent; usually without a floor or windows

pup tent (noun)	shelter tent (noun)
a wedge-shaped tent; usually without a floor or windows	a wedge-shaped tent; usually without a floor or windows