in commando, desperado, tornado, and other words of Spanish and Portuguese origin, "person or group participating in an action," from Latin -atus, pp. suffix of verbs of the first conjugation (cf. -ade).
Supposedly vs. SupposablyHave you ever heard someone use the word supposably and wondered what they meant? Maybe it’s a synonym for supposedly? Or a mistake? Supposedly and supposably are often confused, perhaps most famously by Joey from Friends. Both of these words come from the English word suppose, which is a combination of sup- (a variant of sub- meaning “slightly,” “imperfectly,” “nearly”) and pose meaning “to assert, …
Online Etymology Dictionary, © 2010 Douglas Harper