Misc: What is another name for the card game 'twenty one'?

Questions

In British history a dwelling offering accomodation to the poor?

Cakes or biscuits made with egg whites, sugar and ground almonds or coconut?

Furry, omnivorous american mammals each with a ringed bushy tail and dark stripe across the face?

Trespassing animals disliked by Betsy in Dickens David Copperfield?

An object hard to find because it is hidden by many other similar objects?