Someone who specializes in or has a strong interest in architecture; an architect or architecture expert.
From architecture + -alist (forming nouns for specialists and practitioners). A rare formation from the 19th century, largely replaced by 'architect' as the standard term.
Architecturalist is the long way of saying architect—it sounds more scholarly or obsessed—showing how English loves piling on suffixes to say 'someone really into this thing,' even when a shorter word would work fine!
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