In general, a singular common noun is always preceded by an article - a, an, or the.
Applying the same rule in the following sentence, we get
1) He is good at the word prediction.
I precede word with the since word is singular common noun. However, I am not referring to a specific word, like in sentence
2) He is good at the hidden word prediction.
Hence, I feel in sentence 1, preceding word with the doesn't sound proper, and I expect sentence 1 to be in the following form.
3) He is good at word prediction.
But, with sentence 3, I break the rule by not preceding a singular common noun --word-- with an article.
Please elaborate if 1 or 3 is correct (or both)? Why?