philosophy vs subjective

philosophy is a noun but subjective is not a noun.

Word	Noun	Adjective	Verb	Adverb
philosophy	Yes	No	No	No
subjective	No	Yes	No	No

philosophy (noun)	subjective (noun)
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

philosophy (adjective)	subjective (adjective)
	taking place within the mind and modified by individual bias
	of a mental act performed entirely within the mind