- scabbard-fish
- scapular
- scarus
- scaup-duck
- schooling habit
- scolex
- scomber
- scorpion-fish
- scout
- sculpin
- scuta
- scutate
- scute
- scutum
- scyphozoan
- sea anemone
- sea chestnut
- sea cucumber
- sea elephant
- sea gherkin
- sea hedgehog
- sea lily
- sea pumpkin
- sea robin
- sea slug
- sea sunflower
- sea-bass
- sea-calf
- sea-devil
- sea-flower
- sea-gull
- sea-pad
- sea-pie
- sea-pig
- sea-toad
- sea-unicorn
- screech-owl
- scutal
- scyphistoma
- scythefish
- sea lion
- sea melon
- sea needle
- sea nettle
- sea otter
- sea pilot
- sea raven
- sea snail
- sea swallow
- sea-angel
- sea-cob
- sea-cow
- sea-dog
- sea-ear
- sea-fish
- sea-hog
- sea-horse
- sea-mew
- sea-ox
- sea-orb
- sea-perch
- sea-pike
- sea-sleeve
- sea-urchin
- sea-wolf
- seal
- secondary
- seer-fish
- seir-fish
- selachian
- secretary-bird
- sedentary
- segregate
- seladang
- sergeant-fish
- series
- seminivorous
- seps
- serin
- serotine
- serow
- serpent lizard
- serpent-eater
- serricorn
- serval
- setae
- shad
- seta
- setaceous
- shag
- shanny
- shearwater
- sheartail
- ship-worm
- shipworm
- shovel-nose
- siamang
- sierra
- silkworm
- shark