Collocations for altar - noun

high, main
makeshift, portable
sacrificial

approach, go up to
The bride approached the altar.

face
decorate
The altars were decorated with images.

dedicate
an altar dedicated to Saint John

build
He built an altar to God and made a sacrifice.

boy
cloth, frontal
rail
table
call (esp. AmE)
He accompanied his friend to the front during an altar call.

at an/the altar
Helen and Tony kneeled at the altar.

before an/the altar
He lay prostrate before the high altar.

on an/the altar
He placed the candles on the altar.

altar of
the high altar of the church