is the word GROWTH a countable noun?

Answer 1

Yes and no.
It is not often used in the plural form:
'There has been a growth in profit this year'

Growth also means a lump on the body, which is possibly the only time you will see it in the plural form.
"He had several growths in his armpit."

Then, you can also use it as an uncountable noun:
The 1900s was a period of industrial growth in UK"
I suppose, in this circumstance, many industries are growing, whereas in the first sentence only profit is growing.

Good and tricky qu!

Answer 2

It could be both countable and uncountable.
1. Increase in amount (u)
2.The development of the size (u)
3. Increase in importance (u)
4. The development of someone's character (u)
5. Swelling on your body or under your skin(c)
6. Something that is growing (c, u )

Answer 3

yes: "the fish had several unusual growths on it that indicated disease"