NAVE

The Nave is the central and principal part of a Christian church, extending from the entrance (the narthex) to the transepts (transverse aisle crossing the nave in front of the sanctuary in a cruciform church) or, in the absence of transepts, to the chancel (area around the altar). The nave is that part of a church set apart for the laity, as distinguished from the chancel, choir, and presbytery, which are reserved for the choir and clergy. The separation of the two areas may be effected by screens or parapets, called cancelli. The term nave derives from the Latin navis, meaning “ship,” and it has been suggested that it may have been chosen to designate the main body of the building because the ship had been adopted as a symbol of the church.

Picture taken from : http://www.pitt.edu/~medart/menuglossary/nave.htm

Acknowledgement: http://www.britannica.com/EBchecked/topic/406945/nave

CHANCEL

The Chancel is that part of a church which contains the choir and is often at the eastern end. The name derives from the Latin word for “lattice,” describing the screen that during some eras of church history divided the chancel from the nave and crossing. The word today is often interchangeable with choir or sanctuary.

THE CHURCH OF ST. ANDREWS, CLEWER 
Picture taken from : http://www.standrewsclewer.org.uk/?page_id=86

Acknowledgement: http://www.britannica.com/EBchecked/topic/105298/chancel

CHURCH ARCHITECTURE

Architecture can be defined as the art or science of designing, making and building buildings. Church architecture can be said to be the art of making churches for the worship of Christians. Church architecture is a complex discipline and consists building of the aisle, apse, altar, belfry, buttress, chancel, chapel, gallery, nave, pew, pulpit, spandrels, vault among the other structures

Picture taken from : http://en.wikipedia.org/wiki/Metz_Cathedral

Acknowledgement: http://www.merriam-webster.com/dictionary/architecture

.                             http://www.norwich-churches.org/Glossary/glossary.shtm