轨道

Pinyin: guǐ dào
Meaning：Orbit
Sentence：两艘宇宙飞船将於轨道上连接。The two spacecraft will link up in orbit.

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轨：

Pinyin: guǐ
Meaning: Path; rail; track; course
Radical: 车
Stokes: 6
Traditional: 軌
Common words/Phrase:
轨道 [guǐ dào] 【orbit】
轨迹 [guǐ jì] 【locus; orbit】
出轨 [chū guǐ] 【derailment】
不轨 [bù guǐ] 【against the law or discipline】
轻轨 [qīng guǐ] 【light rail】

道：

Pinyin: dào
Meaning: Method; path; principle; skill; way; road; reason; direction; a measure word; to say; to speak; to talk
Radical: 辶
Stokes: 12
Traditional: 道
Common words/Phrase:
道具 [dào jù] 【property; prop】
道歉 [dào qiàn] 【to apologize】
道德 [dào dé] 【moral; morality; virtue】
道理 [dào li] 【justification; principle; sense; reason; argument; basis】
道路 [dào lù] 【road; path】