Karl,as Nir said in another post, HWMYH in Is 22:2 is not a noun (it is a participle, feminine singular, acting as an adjective).
The same, for instance, as PRYH in Ps 128:3 or HMYH in Pr 7:11.
Coming back to our (+YH (Song 1:7), this is --unfortunately for this discussion-- the only sample in the entire Tanakh of a Qal Participle, singular feminine, of a verb lamed-heh.
You are quite right that many nouns are found ending -YH.Now, what refers to BYRNYH (as you write it), fortified place ----------> the right basic form is BYRNYT (2Ch 17:12), derived from or built on BYRH, castle, palace (2Ch 29:1)
If finelly, after your study of the word in Song 1:7, you decide it is a noun.... I have nothing else to say thereon.
Quite friendly,Pere Porta
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