N - 10 combinations
390. narwhal = fish + unicorn, flying fish + unicorn, ocean + unicorn, sea + unicorn, shark + unicorn, swordfish + unicorn, unicorn + water
391. needle = metal + thread, steel + thread, thread + tool
392. nessie = dinosaur + legend, dinosaur + story, lake + legend, lake + story
393. nest = bird + grass, bird + hay, bird + house, bird + tree, egg + grass, egg + hay, egg + tree
394. net = angler + rope, fish + rope, fishing rod + rope, flying fish + rope, rope + swordfish
395. newspaper = letter + letter, paper + paper, paper + story
396. night = day + time, moon + sky, moon + time, time + twilight
397. ninja = human + katana, human + shuriken
398. ninja turtle = katana + turtle, ninja + turtle, shuriken + turtle
399. nuts = domestication + tree, farmer + tree, field + tree