No, menace and frightening are different.
For instance:
Can you please go do something and stop being a menace in the kitchen.
or//
Can you please stop frightening me with your Halloween mask?
the most frightning thing about a shark it is teeth
Yes, the word 'nightmare' is a noun, a word for a frightening dream; a frightening or horrible experience; a word for a thing.
nothing
the most frightening thing to me was when the wished upon something that ended up messing with their livfes
It means a scary thing to see or witness
God Shots - 2011 Life Without God Is a Frightening Thing 1-2 was released on: USA: 1 January 2011
All-New Dennis the Menace - 1993 It's a Guy Thing 1-3 was released on: USA: 2 October 1993
Funny, Different, Sad, Frightening
Frightening
No. Ominous means showing signs that something bad or unpleasant is about to happen. Threatening means hostile and frightening. An analogy is a comparison between two things, especially a very complicated thing being compared to a simpler thing to illustrate how it works.
The Frightening was created in 2002.
The word "frightening" is an adjective and does not have a plural form. Adjectives in English do not change to reflect number. If you are referring to something that is frightening in plural, you might say "frightening experiences" or "frightening situations."