Greed
Synonymous with avarice or covetousness, greed is an interesting word because of its unusual origins. Greedy, the adjective, comes from Old English grædig and the noun greed is formed by removing the suffix. This is a backformation; usually adjectives are formed by adding a –y suffix to the noun, but this is working in the opposite direction. This seems to have happened earlier in Scots than in English because we have examples in A Dictionary of the Older Scottish Tongue dating from 1584, but the first citation in the Oxford English Dictionary is from 1609 – and even that is from a Scottish writer Simion Grahame. So we can deduce that this is one of the many words which English borrowed from Scots.