past vs old

past and old both are nouns.

past and old both are adjectives.

past is an adverb but old is not an adverb.

Word	Noun	Adjective	Verb	Adverb
past	Yes	Yes	No	Yes
old	Yes	Yes	No	No

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

past: the time that has elapsed
old: past times

Other hyponyms of past include yore, bygone, water under the bridge, history, time immemorial, time out of mind, auld langsyne, good old days, lang syne, langsyne, old times, yesterday.

past (noun)	old (noun)
a verb tense that expresses actions or states in the past	past times
the time that has elapsed
a earlier period in someone's life (especially one that they have reason to keep secret)

past (adjective)	old (adjective)
earlier than the present time; no longer current	of long duration; not new
of a person who has held and relinquished a position or office	(used especially of persons) having lived for a relatively long time or attained a specific age
	skilled through long experience
	(used for emphasis) very familiar
	excellent
	just preceding something else in time or order
	belonging to some prior time

past (adverb)	old (adverb)
so as to pass a given point

Difference between past and old

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