i Register
In some senses, lavatory is marked as archaic, dated. Watch for register when choosing this word.
ADJ
public | communal, shared | indoor, inside | outside | flush, flushing
VERB + LAVATORY
go to, use | need | flush, flush sth down
LAVATORY + NOUN
basin, bowl | seat | cistern | chain | paper | brush
PREP
in the ~, on the ~