Assistance.
The formal word for "help" is "assistance." It denotes the act of providing support or aid to someone in need. In various contexts, other synonyms like "aid," "support," or "facilitation" may also be appropriate.
Formal is not a compound word.
The formal word for sister is "sibling."
No, formal is an adjective, the adverb is formally.
The formal word for grandmother in Portuguese is "avó."
what is another word for promise? A vow or an oath
Informal? semi-formal
Formal is an adjective.
Another word for a formal speech is an oration or a discourse.
A formal disapproval is a reprimand.
yes
"Occur" would work, however, happen is appropriate in most situations.