No. Leaving out spaces is not what makes a compound noun “legitimate”. Being a common combination is what grants it its own dictionary entry. Things like {ropyaH qach} for “hospital” and {'Iw HIq} for “bloodwine” are lexicalized terms because they have a specific meaning when the words are used together, regardless of whether or not they remain separated by a space when used.
You must have misunderstood me. 'Iw HIq and ropyaH qach are lexicalized, I haven't denied that. Both compounds are included in a dictionary, so they both are legitimate (this is Okrand's definition of "legitimate"). My argument was that they should be written without space: in TKD Okrand says that legitimate copounds don't have a space.
You refer to these as "compounds", but I believe that this isn't correct by the terminology used in TKD. These are both noun-noun constructions.
TKD gives us these examples of "compound nouns": "earthworm", "password", {jolpa'}, {tIjwI'ghom}. In both English and Klingon, what they have in common is that they are written without a space.
TKD gives us these examples of "noun-noun constructions'': {nuH[vam] pegh}, {jaghpu' yuQmey[Daq]}, {puqwI' qamDu'}, {nagh Dung[Daq]}. They are all written with a space in between (and furthermore, the first noun can take a suffix).
Your argument draws the wrong conclusion from the explanation in TKD of what makes a "legitimate" compound noun. {'Iw HIq} and {ropyaH qach} are written with a space in the dictionary because they are noun-noun constructions, i.e., nouns which have been combined (to quote TKD section 3.4) "in the manner of a compound noun to produce a new construct even if it is not a legitimate compound noun ('legitimate' in the sense that it would be found in a dictionary)". The implied "legitimate compound nouns" in this case are *{'IwHIq} and *{ropyaHqach}, which are *not* found in the dictionary. {'Iw} and {HIq} have been combined in the *manner* of a compound noun, but it's not a "legitimate" compound noun. Since TKD says that "legitimate" compound nouns are written without a space, the correct conclusion here should be that {'Iw HIq} (which is not a compound noun at all, though it's constructed in the manner of one) should be written *with* a space.
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De'vID