pillar vs atlas

pillar and atlas both are nouns.

Word	Noun	Adjective	Verb	Adverb
pillar	Yes	No	No	No
atlas	Yes	No	No	No

As nouns, atlas is a hyponym of pillar; that is, atlas is a word with a more specific, narrower meaning than pillar:

pillar: (architecture) a tall vertical cylindrical structure standing upright and used to support a structure
atlas: a figure of a man used as a supporting column

Other hyponyms of pillar include telamon, caryatid, newel, pilaster, pile, piling, spile, stilt, support column.

pillar (noun)	atlas (noun)
(architecture) a tall vertical cylindrical structure standing upright and used to support a structure	a figure of a man used as a supporting column
a vertical cylindrical structure standing alone and not supporting anything (such as a monument)	the 1st cervical vertebra
a fundamental principle or practice	a collection of maps in book form
a prominent supporter
anything that approximates the shape of a column or tower