Using the Scrabble dictionary, is this a valid word?
https://scrabblewordfinder.org
Collins Scrabble word check
https://scrabble.collinsdictionary.com/check/
Merriam Webster
https://merriam-webster.com/dictionary/dog
Word Unscrambler
https://www.wordunscrambler.net/scrabble-word-finder.aspx
Tournament Word Lists
The OSPD 7th edition is the Official Scrabble Players Dictionary. (I don't think this is available online.)
The Collins 2019 list. A Wikipedia article. Online dictionary.
The most commonly used word lists in tournament play are the OSPD and Collins. The Honolulu Scrabble Club (HSC) uses Collins.
Here is a video that explains the difference.
Note that a tournament might use different word lists at different levels.
WESPA uses the Collins 2019 list.
NASPA uses the Collins 2015 list according to the rules on its website. This has probably been updated.
OWL
[find my notes for this webpage]
My Scrabble Word List Spreadsheet
How to memorize the two letter Scrabble words! by Dave Shaw, PhD. This is a very nice systematic way to learn the 2-letter OSPD Scrabble words. Received from Judith and Dave. They are hereby awarded a Bingo!
From AA to ZA: Memorize every two letter Scrabble word with these 5 tips from the games experts.
Links to Word Lists
An article titled "The Ultimate Scrabble WORD LIST RESOURCE" https://scrabble.wonderhowto.com/news/ultimate-scrabble-word-list-resource-0115617/ has links to many word lists.
Unorganized notes
Random notes until I organize them
https://www.thesprucecrafts.com/scrabble-three-letter-j-words-412389
https://scrabble.merriam.com/q-words-without-u
===== Bingo Stems
https://scrabble.merriam.com/bingo-stems
Wordlists
Words without A, E, I, O, U vowels
Words using W as the vowel
Words using Y as the vowel
The 2 and 3 letter words
There are now 107 accepted 2-letter words and
3xx 3-letter words
Collins Scrabble Words 2 letters history
Short Z, Q, J, and X words
Acceptable Scrabble words without a vowel
Vowel heavy words
Bingo stems
Appendix 4 of "Everything Scrabble"