seed money vs working capital

seed money and working capital both are nouns.

Word	Noun	Adjective	Verb	Adverb
seed money	Yes	No	No	No
working capital	Yes	No	No	No

As nouns, working capital is a hypernym of seed money; that is, working capital is a word with a broader meaning than seed money:

seed money: capital needed to set up a new business or enterprise
working capital: assets available for use in the production of further assets

Other hypernyms of seed money include capital.

seed money (noun)	working capital (noun)
capital needed to set up a new business or enterprise	assets available for use in the production of further assets