latitude vs line of latitude

latitude and line of latitude both are nouns.

Word	Noun	Adjective	Verb	Adverb
latitude	Yes	No	No	No
line of latitude	Yes	No	No	No

As nouns, latitude and line of latitude are synonyms defined as:

latitude and line of latitude: an imaginary line around the Earth parallel to the equator

Other synonyms of latitude include parallel, parallel of latitude.

latitude (noun)	line of latitude (noun)
scope for freedom of e.g. action or thought; freedom from restriction	an imaginary line around the Earth parallel to the equator
the angular distance between an imaginary line around a heavenly body parallel to its equator and the equator itself
an imaginary line around the Earth parallel to the equator
freedom from normal restraints in conduct