A gargoyle usually functions as a gutter drainage system, a grotesque is just for decor.
A gargoyle is technically a functioning waterspout. In medieval times (and occasionally today), they were carved as grotesque figures to protect from evil spirits. However, the lines have become blurred and people frequently refer to any grotesque ornamental carving as a gargoyle. However, a gargoyle need not represent anything. Any waterspout relieving water from a building is a gargoyle. I am confident of this answer. I have a bachelor of architectural history and a master of architecture and I am a licensed architect.
Gargoyle is a term that comes from the spout that drained water in most of their throats, and it sounded like "gargling", hence the gargoyle.
Gargoyle in German is wasserspeier.
My children are scared of the gargoyle on the building.
The Gargoyle - newspaper - was created in 1954.
Grey Gargoyle was created in 1964.
Gargoyle Games was created in 1983.
Gargoyle's Quest happened in 1990.
Geis of the Gargoyle was created in 1995-02.
Geis of the Gargoyle has 315 pages.
Gargoyle's Quest II happened in 1992.
Gargoyle Humor Magazine was created in 1909.