Yes, endings is a Scrabble word!

Verb

1. Have an end, in a temporal, spatial, or quantitative sense; either spatial or metaphorical

2. Bring to an end or halt

3. Be the end of; be the last or concluding part of

4. Put an end to

Noun

1. The end of a word (a suffix or inflectional ending or final morpheme)

2. The act of ending something

3. The point in time at which something ends

4. Event whose occurrence ends something

5. The last section of a communication