Moor ship at sea - but it looks the same (8)

I believe the answer is:

isomorph

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'it looks the same' is the definition.
The definition suggests a singular noun which matches the answer.

'moor ship at sea' is the wordplay.
'at sea' indicates anagramming the letters.
'moor'+'ship'='moorship'
'moorship' is an anagram of 'ISOMORPH'.

'but' acts as a link.

Can you help me to learn more?

(Other definitions for isomorph that I've seen before include "one exhibiting corespondence" , "unchanged in shape" .)

I've seen this clue in The Irish Times.

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