Use "lexical gap" in a sentence

1. Aesthesia has fallen into disuse as an independent term, with the words sensation and sensibility filling the lexical gap; however, the root form, -Aesthesia (as in anaethesia, parAesthesia, etc.), is in common active use in the working medical parlance.

2. Aesthesia has fallen into disuse as an independent term, with the words sensation and sensibility filling the lexical gap; however, the root form, -Aesthesia (as in anaethesia, parAesthesia, etc.), is in common active use in the working medical parlance