Archaic standalone noun meaning 'kind' or 'sort'. In modern Japanese, this word is almost never used alone; it survives in compounds like 語彙 (ごい).
Some old dictionaries explain 彙 as 'kind' or 'sort'.
vocabulary; lexicon
dictionary of Chinese characters
mountain mass; small mountain range; group of mountains
bulletin; collection of reports
same kind or class; classification
glossary; dictionary
The kanji 彙 originally meant 'hedgehog' and later came to mean 'collection' or 'category'. The standalone noun use is archaic; the character is now mainly used in compounds.