risk capital vs working capital

risk capital and working capital both are nouns.

Word	Noun	Adjective	Verb	Adverb
risk capital	Yes	No	No	No
working capital	Yes	No	No	No

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

risk capital: wealth available for investment in new or speculative enterprises
working capital: assets available for use in the production of further assets

Other hypernyms of risk capital include capital.

risk capital (noun)	working capital (noun)
wealth available for investment in new or speculative enterprises	assets available for use in the production of further assets