Those other four, yes. Trawling through 80's Oscar nominees, here are ones I know nothing about:
7 nominations: Places in the Heart
5 nominations: Atlantic City, The Dresser, Silkwood, The River, Yentl, Gorillas in the Mist
Was tempted to add Prizzi's Honor which I've heard of, and got 8 nominstions, but seems to have been seen by hardly anyone. Jack Nicholson did quite a bit of forgotten prestige stuff in the 80's. Has anyone seen Ironweed?
Gorrilas In The Mist got five as well, do people still watch that?