buy in vs overstock

buy in and overstock both are verbs.

Word	Noun	Adjective	Verb	Adverb
buy in	No	No	Yes	No
overstock	No	No	Yes	No

As verbs, overstock is a hyponym of buy in; that is, overstock is a word with a more specific, narrower meaning than buy in:

buy in: amass so as to keep for future use or sale or for a particular occasion or use
overstock: stock excessively

Other hyponyms of buy in include understock.

buy in (verb)	overstock (verb)
amass so as to keep for future use or sale or for a particular occasion or use	stock excessively