Bulk

gros

(large in size, mass, or volume)

massif

(large in size, mass, or volume)

volumineux

(large in size, mass, or volume)

ensemble

(major part of something)

essentiel

(major part of something)

gros

(major part of something)

grosseur

(volume)

masse

(volume)

prise de masse

(bodybuilding: period of growing muscle)

volume

(volume)

vrac

(unpackaged goods in transport)