most important

participation, partnership, company

neutral need, commonly known as pissing and latrine etc

necessary, indispensable, essential, unavoidable, obligatory, requisite, needful, urgent

not so necessary

unimportant, unnecessary

a limited company

without sharing with anyone, solely, alone, all by oneself

accompanying in one's sorrow, consoler

that which must be expressed or described

battle or war to be fought, having dispute

to become bitter, angry, unhappy

sink, be drowned

obtain hearing, be attended (to), have response (to)