vocabulary size

The synonymizer doesn't agree with you (and I agree with it).

Words with similar meanings are not necessarily synonyms. So, I don't agree with the synonymizer. Synonyms should have overlapping meanings in a sufficient number of contexts. "To adore" is much closer in meaning to "to be a fan," "to idolize." Well, maybe "big" and "huge" are a bit better, but even so, the first only describes size and rarely carries any emotion, while the second, in 100% of cases, carries some emotion of surprise or something similar. Huge is astonishingly big.
I have about 5,000 words in English, which is not very good, unfortunately.