Yes, lymph is a Scrabble word!
...and is worth 15 points in Scrabble, and 16 points in Words with Friends
lymph
Noun
1. A thin coagulable fluid (similar to plasma but) containing white blood cells (lymphocytes) and chyle; is conveyed to the blood stream by lymphatic vessels
What Scrabble words can I make with the letters in lymph?
3 Letter Words
2 Letter Words