viaticus vs purchasing

viaticus and purchasing both are nouns.

Word	Noun	Adjective	Verb	Adverb
viaticus	Yes	No	No	No
purchasing	Yes	No	No	No

As nouns, purchasing is a hypernym of viaticus; that is, purchasing is a word with a broader meaning than viaticus:

viaticus: purchasing insurance policies for cash from terminally ill policy holders
purchasing: the act of buying

Other hypernyms of viaticus include buying.

viaticus (noun)	purchasing (noun)
purchasing insurance policies for cash from terminally ill policy holders	the act of buying