annual parallax vs parallax

annual parallax and parallax both are nouns.

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

As nouns, parallax is a hypernym of annual parallax; that is, parallax is a word with a broader meaning than annual parallax:

annual parallax: the parallax of a celestial body using two points in the earth's orbit around the sun as the baseline
parallax: the apparent displacement of an object as seen from two different points that are not on a line with the object

annual parallax (noun)	parallax (noun)
the parallax of a celestial body using two points in the earth's orbit around the sun as the baseline	the apparent displacement of an object as seen from two different points that are not on a line with the object