(Note that this list still lacks many important ships.)
(The HMS Pinafore was a fictional creation of Gilbert and Sullivan.)
... Agoraphobia Agrizoophobia[?] Agyria pachygyria polymicrogyria[?] Agyria-pachygyria type 1[?] Agyrophobia[?] Ahumada-Del Castillo syndrome[?] Aicardi ...