1) Adult 2) Big, now 3) Full-grown 4) Fully developed 5) Fully grown 6) Fully-developed 7) Grown 8) Mature 9) Mature, presumably 1) Conservativist 2) Disarmer 3) Grown 4) Homebody 5) Host 6) Militarist 7) Oldster 8) Pacificist 9) Pledgee 10) Pledger 11) Sobersides 12) Sophisticate 13) Warmonger 
A grownup is an adult. Grownup may also refer to: ...