aclinic line vs magnetic equator

aclinic line and magnetic equator both are nouns.

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

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

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

aclinic line (noun)	magnetic equator (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