annual parallax vs heliocentric parallax

annual parallax and heliocentric parallax both are nouns.

Word	Noun	Adjective	Verb	Adverb
annual parallax	Yes	No	No	No
heliocentric parallax	Yes	No	No	No

As nouns, annual parallax and heliocentric parallax are synonyms defined as:

annual parallax and heliocentric parallax: the parallax of a celestial body using two points in the earth's orbit around the sun as the baseline

annual parallax (noun)	heliocentric parallax (noun)
the parallax of a celestial body using two points in the earth's orbit around the sun as the baseline	the parallax of a celestial body using two points in the earth's orbit around the sun as the baseline