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I'm writing about a new technology "Input Optimised Filtering" (not the actual name but a good example). I'm wondering whether this can/needs to be hyphenated (Input-Optimised Filtering), or not.

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    Preliminary point: if indeed "input+optimised is a compound word, then it must be written as a single word, in this case hyphenated. There are a few syntactic tests that can be performed to check for compoundhood. One test is: can the component parts enter separately into relations of coordination? i.e. can input + optimised filtering become a coordination as in [input- and optimised-] filtering. Another is: can the individual components be modified as in, for example "input-[xyz optimised filtering]". If the answer to either one of those tests is no, then it's probably a compound.
    – BillJ
    Jan 27, 2021 at 18:23
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    Note also that if it is written as two separate words it is an adjective (or noun) phrase i.e. a syntactic construction consisting of modifier+head. By contrast, if two bases combine to form a single word, then it is a compound.
    – BillJ
    Jan 27, 2021 at 18:31

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