When splitting the compound adjective 'onboard', there are two words; 'on' and 'board'. 'On' is a preposition, but what part of speech is 'board'?

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    Parts of words are not parts of speech. On in onboard is not a preposition, but a prefix. – jlawler May 17 '20 at 21:52
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    The bases of compound words can be analysed by their word classes (parts of speech). For example, the compound adjective "threadbare", consists of noun+adjective. And the compound adjective "awe-inspiring" consists of noun+gerund-participle verb. Your example has the preposition "on" as its first base, but I'm just not sure whether "board" is a noun or a verb here. – BillJ May 18 '20 at 6:26
  • @BillJ that is what I was wondering, whether 'board' is a noun or verb – Springroll404 May 18 '20 at 19:57
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    I think "board" should be considered a noun. Other prep+noun compound adjectives include "up.market hotel" and "in.flight entertainment". – BillJ May 19 '20 at 8:22
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    Thanks @BillJ I missed that! guess I read too quickly. Deleting the comment. – Binyomin May 19 '20 at 12:54

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