As nouns the difference between grotto and grottowork
is that grotto is a small cave while grottowork is artificial ornamental rockwork in imitation of a grotto.
grotto
English
Noun
(
wikipedia grotto)
(
en-noun)
A small cave.
An artificial cavern-like retreat.
A Marian shrine, usually built in a cavern-like structure.
Derived terms
* grot
grottowork
English
Noun
(
en-noun)
artificial ornamental rockwork in imitation of a grotto
- (Cowper)
(
Webster 1913)