What are some words that end in ic but then you can add ian?

Adjective forms of some nouns use the suffix -ic. There are also verbs and nouns that end in -ic (critic, logic, magic, panic, picnic, traffic). These are adjectives that have the suffix -ic (the adjectives) :

allergic

altruistic

athletic

barbaric

basic

catastrophic

caustic

fantastic

fatalistic

idealistic

idiotic

ironic

lethargic

majestic

metallic

microscopic

mystic

patriotic

pessimistic

poetic

prolific

psychic

realistic

ritualistic

sarcastic

sardonic

scientific

specific

terrific

toxic

tragic