Yes, plumbs is a Scrabble word!
...and is worth 12 points in Scrabble, and 17 points in Words with Friends
plumbs
Verb
1. Measure the depth of something
2. Weight with lead
3. Examine thoroughly and in great depth
4. Adjust with a plumb line so as to make vertical
Noun
1. The metal bob of a plumb line
What Scrabble words can I make with the letters in plumbs?
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Words that can be created with an extra letter added to plumbs:
A:pablums