Nominal terms for love between sisters (5)

I believe the answer is:

nouns

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'nominal terms' is the definition.
'nouns' can be an answer for 'terms' (I've seen this before). I am not certain of the 'nominal' bit.

'love between sisters' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'between' is an insertion indicator.
'sisters' becomes 'nuns' (I've seen this in another clue).
'o' placed inside 'nuns' is 'NOUNS'.

'for' is the link.

Can you help me to learn more?

(Other definitions for nouns that I've seen before include "Words of particular type" , "Some of them are proper" , "Words indicating names" , "They can be used to refer to persons, places or things" , "Naming words" .)

I've seen this clue in the Sydney Morning Herald.

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