Yes, CHECKING is a Scrabble word!

verb

1. examine so as to determine accuracy, quality, or condition
2. make an examination or investigation
3. be careful or certain to do something; make certain of something
4. lessen the intensity of; temper; hold in restraint; hold or keep within limits
5. stop for a moment, as if out of uncertainty or caution
6. put a check mark on or near or next to
7. slow the growth or development of
8. be verified or confirmed; pass inspection
9. be compatible, similar or consistent; coincide in their characteristics
10. block or impede (a player from the opposing team) in ice hockey
11. develop (children's) behavior by instruction and practice; especially to teach self-control
12. consign for shipment on a vehicle
13. hand over something to somebody as for temporary safekeeping
14. abandon the intended prey, turn, and pursue an inferior prey
15. stop in a chase especially when scent is lost
16. mark into squares or draw squares on; draw crossed lines on
17. decline to initiate betting
18. hold back, as of a danger or an enemy; check the expansion or influence of
19. place into check
20. write out a check on a bank account
21. find out, learn, or determine with certainty, usually by making an inquiry or other effort
22. verify by consulting a source or authority
23. arrest the motion (of something) abruptly
24. make cracks or chinks in
25. become fractured; break or crack on the surface only