What is the word for not being able to remember a word?

Answer 1

Please do find it for all of us who suffer this prevalent inability to remember what the object of our conversation was, and I do remember it as an hapax legomenon, which is a word that occurs only once in worldwide literature, because some genius remembered hem's Greek roots and put two plus two plus two together and came up with sex, which is Latin for VI, so let's get to work searching world lit.

Answer 2

The word is "tip-of-the-tongue phenomenon."