Note that these are not synonyms. There are now two separate HPO terms. Note the comment of trigonocephaly: "This shape should be assessed from above, with the examiner looking down on the head of the patient. Trigonocephaly can be caused by premature fusion of the metopic suture.". I added metopic suture craniosynostosis as a synonym to metopic synostosis.
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Note that these are not synonyms. There are now two separate HPO terms. Note the comment of trigonocephaly: "This shape should be assessed from above, with the examiner looking down on the head of the patient. Trigonocephaly can be caused by premature fusion of the metopic suture.". I added metopic suture craniosynostosis as a synonym to metopic synostosis.