catacomb

As nouns the difference between catacomb and pyramid

is that catacomb is an underground system of tunnels and chambers with recesses for graves, used (in former times) as a cemetery; a subterranean tunnel system used for burying the dead, as in Paris or ancient Rome while pyramid is an ancient massive construction with a square or rectangular base and four triangular sides meeting in an apex, such as those built as tombs in Egypt or as bases for temples in Mesoamerica.

As a verb pyramid is

to combine (a series of genes) into a single genotype.

As nouns the difference between dungeon and catacomb

is that dungeon is an underground prison or vault, typically built underneath a castle while catacomb is an underground system of tunnels and chambers with recesses for graves, used (in former times) as a cemetery; a subterranean tunnel system used for burying the dead, as in Paris or ancient Rome.

As nouns the difference between catacomb and fossor

is that catacomb is an underground system of tunnels and chambers with recesses for graves, used (in former times) as a cemetery; a subterranean tunnel system used for burying the dead, as in paris or ancient rome while fossor is a gravedigger in the catacombs of ancient rome.