Tajikistan is a see also of turkestan.

As proper nouns the difference between tajikistan and turkestan

is that tajikistan is country in central asia official name: republic of tajikistan while turkestan is the regions of central asia lying between siberia to the north; tibet (xizang) and xinjiang, china, modern-day pakistan, afghanistan, and iran to the south; the gobi desert to the east; and the caspian sea to the west.