As nouns the difference between terms and clientness
is that terms is while clientness is the state, condition, or quality of a client.
terms
English
Noun
(head)
Statistics
*
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clientness
English
Noun
(-)
The state, condition, or quality of a client.
References
* Google Books: [https://www.google.co.uk/search?tbs=bks%3A1&tbo=1&q=%22clientness%22&btnG=Search+Books&gws_rd=ssl]