How many words are there in igbo?

It's not possible to count the Words in any language, because there is no universal definition of what a Word is. But most estimates place the number between 40,000 and 160,000 Words(which is the same range for almost all other languages).

Note: The language with the largest number of Words is English, estimated at 170,000 to 250,000 Words. No language has more Words than English.