As nouns the difference between sis and sibs
is that
sis is shortened form of sister while
sibs is plural of lang=en.
As an initialism SIS
is
Secret Intelligence Service
sis
English
Initialism
(Initialism)
(head)
(British)
Synonyms
*
* Secret Intelligence Service
See also
* GCHQ
*
* SAS
* SBS
Anagrams
*
* sibs
English
Noun
(head)
Anagrams
*