| aeronaut | (noun) someone who operates an aircraft | Synonyms: aviator, flier, flyer |
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| aquanaut | (noun) an underwater swimmer equipped with a face mask and foot fins and either a snorkel or an air cylinder | Synonyms: skin-diver |
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| (noun) a skilled worker who can live in underwater installations and participate in scientific research | Synonyms: oceanaut |
| argonaut | (noun) someone engaged in a dangerous but potentially rewarding adventure | - |
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| astronaut | (noun) a person trained to travel in a spacecraft | Synonyms: cosmonaut, spaceman |
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| cosmonaut | (noun) a person trained to travel in a spacecraft | Synonyms: astronaut, spaceman |
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| cybernaut | (noun) a computer user who uses the internet; someone who explores cyberspace | - |
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| juggernaut | (noun) a massive inexorable force that seems to crush everything in its way | Synonyms: steamroller |
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| oceanaut | (noun) a skilled worker who can live in underwater installations and participate in scientific research | Synonyms: aquanaut |
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