pillar vs friend

pillar and friend both are nouns.

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

As nouns, friend is a hypernym of pillar; that is, friend is a word with a broader meaning than pillar:

Other hypernyms of pillar include admirer, booster, champion, protagonist, supporter.

pillar (noun)	friend (noun)
(architecture) a tall vertical cylindrical structure standing upright and used to support a structure	a person you know well and regard with affection and trust
a vertical cylindrical structure standing alone and not supporting anything (such as a monument)	a person with whom you are acquainted
a fundamental principle or practice	an associate who provides cooperation or assistance
a prominent supporter	a person who backs a politician or a team etc.
anything that approximates the shape of a column or tower