secular humanism vs philosophy

secular humanism and philosophy both are nouns.

Word	Noun	Adjective	Verb	Adverb
secular humanism	Yes	No	No	No
philosophy	Yes	No	No	No

As nouns, philosophy is a hypernym of secular humanism; that is, philosophy is a word with a broader meaning than secular humanism:

secular humanism: the doctrine emphasizing a person's capacity for self-realization through reason; rejects religion and the supernatural
philosophy: a belief (or system of beliefs) accepted as authoritative by some group or school

Other hypernyms of secular humanism include doctrine, ism, philosophical system, school of thought.

secular humanism (noun)	philosophy (noun)
the doctrine emphasizing a person's capacity for self-realization through reason; rejects religion and the supernatural	the rational investigation of questions about existence and knowledge and ethics
	a belief (or system of beliefs) accepted as authoritative by some group or school
	any personal belief about how to live or how to deal with a situation