Weather Man is two words
Material man, two words.
The word weather has two syllables.
"Look Out" is an exclamation. Therefore two words. Lookout - a man or location. noun. One word. www.youtube/visitchew
Both are okay.
Men is plural. One man. Two men.
The Romans had two words for man. If one were speaking about mankind in general, as opposed to a god or animal, he would use the word homo. If he were speaking about a grown man, as opposed to a boy, the word used was vir.
The woman asked "How was your sex life". The man replied "Infrequently", and she said "Is that one word or two".
There are two syllables. Wea-ther.
The two syllables are: weath-er.
It is used as one word.
he
Two