role model be used as an adjective? For example, in a thank you letter:
Thanks to my role model friends
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Its allowed (its clear, understandable) but there are better ways of phrasing it. In the context of a thank-you letter (that is addressed to your friends):
Thanks to you, my friends and the best role models I could hope for.
This kind of exaggerated style is common is such contexts. In this is normal to use more words than needed. You could, for example make two sentences
Thanks to you, my friends. You have been the best role models I could hope for.