'HD' is not a word in the english language, so no.
It also is an acronym.
Acronyms are not words.
However, the words that the acronym 'HD' stands for, may be allowed.
Such words may include:
High
Hard
Density
Definition
Drive
Disk
A Scrabble word is an English word that you can use in the Scrabble game.
AG is a legal word in scrabble.
Yes ig is a scrabble word
No, it's not a valid Scrabble word.
Yup. You can use the word "ag" in Scrabble.
Yes. Cate is a legal Scrabble word.
Yes, the word queen is an acceptable word in Scrabble.
No. VIZ is not a legal English scrabble word.
Yes. You can use the word haj in Scrabble.
Yes, "quo" is an acceptable word to use in the game of Scrabble.
Yes, you can use the word "arithmetic" in Scrabble as long as it is found in the dictionary being used for the game. Scrabble players are allowed to use any word that is listed in an approved dictionary.
No. Wa is not allowed in Scrabble.