shibah vs shivah

shibah and shivah both are nouns.

Word	Noun	Adjective	Verb	Adverb
shibah	Yes	No	No	No
shivah	Yes	No	No	No

As nouns, shibah and shivah are synonyms defined as:

shibah and shivah: (Judaism) a period of seven days of mourning after the death of close relative

Other synonyms of shibah include shiva.

shibah (noun)	shivah (noun)
(Judaism) a period of seven days of mourning after the death of close relative	(Judaism) a period of seven days of mourning after the death of close relative