It could be as many as 1,000,000 words but a standard dictionary will contain around 60,000. As for the "richness" of language, English has many more synonyms than many other languages which means there is a lot of choice between similar words which can give any expression different moods and feelings but keep the same meaning.

hi cute girl i think that i had added u just accepte my invitation or try to add me so i can help u in any thing you need its from my pleasure