The possessive form is the visitors' lounge.
If it was the private lounge for just one teacher, the singular possessive form is "teacher's lounge".If it was the common lounge used by many teachers, the plural possessive form is "teachers' lounge".
The possessive phrase would be "the teacher's book."
The possessive form of the plural noun pilots is pilots'.Example: You will find him in the pilots' lounge.
The possessive noun phrase is the fathers' rights.
The possessive form for the plural noun is members'.example: You will find Mr. Hawthorne in the members' lounge.
The possessive form of the plural noun gentlemen is gentlemen's.Example: The gentlemen's lounge is on the second floor.
The possessive form for the plural noun doctors is doctors'.Example: The doctors' lounge is on the third floor.
The possessive noun phrase is the fathers' rights.
The possessive form of the plural noun teachers is teachers'.A possessive noun is placed before a noun to indicate ownership, possession, origin, or purpose of that noun.Example: The meeting is at four in the teachers' lounge.
There is no possessive noun unless you change the phrase to read, 'the children's telephone'. In this example the possessive noun is children's.
The possessive form is the protesters' opinion.
The possessive form is the friends' committee.