| AERONAUTS | • aeronauts n. Plural of aeronaut. • aëronauts n. Plural of aëronaut. • AERONAUT n. a traveller through the air; a balloonist, a pilot. |
| AQUANAUTS | • aquanauts n. Plural of aquanaut. • AQUANAUT n. a skin-diver; someone who explores and/or lives in the sea at considerable depth. |
| ARGONAUTS | • argonauts n. Plural of argonaut. • ARGONAUT n. (Greek) a sort of cuttlefish, aka paper nautilus. |
| LUNANAUTS | • lunanauts n. Plural of lunanaut. • LUNANAUT n. an astronaut who has travelled to the moon, also LUNARNAUT. |
| OCEANAUTS | • oceanauts n. Plural of oceanaut. • OCEANAUT n. someone who lives for periods under the sea, to observe and explore. |
| ASTRONAUTS | • astronauts n. Plural of astronaut. • ASTRONAUT n. a person engaged in space travel. |
| COSMONAUTS | • cosmonauts n. Plural of cosmonaut. • COSMONAUT n. a Russian astronaut. |
| CYBERNAUTS | • cybernauts n. Plural of cybernaut. • CYBERNAUT n. a person using the Internet. |
| HYDRONAUTS | • hydronauts n. Plural of hydronaut. • HYDRONAUT n. a person trained to work in an underwater vessel. |
| LUNARNAUTS | • lunarnauts n. Plural of lunarnaut. • LUNARNAUT n. one who travels to the moon, also LUNANAUT. |
| TAIKONAUTS | • taikonauts n. Plural of taikonaut. • TAIKONAUT n. a Chinese astronaut. |
| ZORBONAUTS | • zorbonauts n. Plural of zorbonaut. • ZORBONAUT n. one who engages in zorbing. |
| JUGGERNAUTS | • juggernauts n. Plural of juggernaut. • JUGGERNAUT n. (Sanskrit) a massive relentless force, person, institution, etc. that crushes everything in its path. |