Yes, congratulations can be used as an interjection as well as a noun.
The interjection congrats is an informal term. The proper word is spelled "congratulations".
Congratulations is a noun. Example: I'd like to offer my congratulations on your recent engagement. It's is also used as an interjection. Example: Congratulations! You're getting married!
Yes. It is the act of congratulating.Most of the time, it's used as an interjection. Congratulations!
its an interjection
No, it is not an interjection.
"The" is not an interjection.
it is an interjection
It is a interjection lol
It's Congratulations :)
interjection
Yes, "Help" is an interjection.
Yes, "ouch" is an interjection.