Keyword Analysis & Research: what is the difference between a md and an do

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what is the difference between a md and an do	0.12	0.4	4410	65	45
what	1.36	0.3	3296	67	4
is	0.93	0.2	5280	43	2
the	0.15	0.9	705	33	3
difference	0.19	0.3	1479	4	10
between	1.34	0.6	6539	28	7
a	0.04	0.1	6759	65	1
md	0.39	0.8	6905	16	2
and	1.84	0.7	378	15	3
an	0.36	0.3	8095	37	2
do	1.89	0.5	219	53	2

Keyword	CPC	PCC	Volume	Score
what is the difference between a md and an do	1.58	0.9	6072	44