Keyword Analysis & Research: what is the common noun in this sentence

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what is the common noun in this sentence	0.38	0.3	3443	97	40
what	0.78	0.3	5785	22	4
is	0.28	1	1006	76	2
the	1.59	1	1985	97	3
common	0.42	0.6	5345	88	6
noun	1.84	0.9	9841	65	4
in	0.19	0.1	7073	5	2
this	1.98	0.1	9568	37	4
sentence	0.27	0.5	9075	8	8

Keyword	CPC	PCC	Volume	Score
what is the common noun in this sentence	0.89	0.7	5194	29