magnetic equator vs aclinic line

magnetic equator and aclinic line both are nouns.

Word	Noun	Adjective	Verb	Adverb
magnetic equator	Yes	No	No	No
aclinic line	Yes	No	No	No

As nouns, magnetic equator and aclinic line are synonyms defined as:

magnetic equator and aclinic line: an imaginary line paralleling the equator where a magnetic needle has no dip

magnetic equator (noun)	aclinic line (noun)
an imaginary line paralleling the equator where a magnetic needle has no dip	an imaginary line paralleling the equator where a magnetic needle has no dip