The word Vipassana is a Sanskrit word which means Insight, Clear Seeing, or Special Seeing.
Vipassana literally means Vi refers to = वि = विविध - Miscellaneous, Multi,
Passana stands for = Watching;
So, Vipassana means Watching the same thing in multi-dimensions and judging the truth and see the thing the way it is.
Vipassana means to see things as they are in reality.
Kayanupassana literally means: Kaya is a Sanskrit word which means Body, and Upasana is also a Sanskrit word which means Worship. Thus, Kayanupassana means to worship the body as a temple. In Buddhism, Kayanupassana is observing the body while doing Meditation.
Vedananupassana literally means: Vedana is a Sanskrit word which means Pain, and Upasana is also a Sanskrit word which means Worship. Thus, Vedananupassana is considered as feelings which may give pains or happiness accordingly, Vedananupassana is being mindful of your feelings.
Cittanupassana literally means: Citta or Chitta is a Sanskrit word which means Mind, and Upasana is also a Sanskrit word which means Worship. Thus, Cittanupassana is considered as being a witness of the Chitta and observing the thoughts in Mind.
Dhammanupassana literally means: Dhamma is a Sanskrit word which means Uplift or Upholds, and Upasana is also a Sanskrit word which means Worship. Thus, Dhammanupassana is considered as increasing the level of spirituality by being mindful of Mental Objects.