Yes, pig is a Scrabble word!
...and is worth 6 points in Scrabble, and 8 points in Words with Friends
pig
Verb
1. Live like a pig, in squalor
2. Eat greedily
3. Give birth
Noun
1. Domestic swine
2. A coarse obnoxious person
3. A person regarded as greedy and pig-like
4. Uncomplimentary terms for a policeman
5. Mold consisting of a bed of sand in which pig iron is cast
6. A crude block of metal (lead or iron) poured from a smelting furnace
What Scrabble words can I make with the letters in pig?
3 Letter Words
2 Letter Words