| bedrock(noun, base, foot, nadir, basement) |
| bit(noun, portion, section, segment, partition) |
| brunt(noun, core, chief, bulk, generality) |
| bulk(noun, core, chief, generality, brunt) |
| burden(noun, core, chief, bulk, generality) |
| center(noun, core, chief, bulk, generality) |
| chief(noun, core, bulk, generality, brunt) |
| component(noun, portion, section, segment, partition) |
| constituent(noun, portion, section, segment, partition) |
| core(noun, chief, bulk, generality, brunt) |
| crux(noun, core, chief, bulk, generality) |
| cut(noun, portion, section, segment, partition) |
| element(noun, portion, section, segment, partition) |
| entirety(noun, core, chief, bulk, generality) |
| essence(noun, core, chief, bulk, generality) |
| essentiality(noun, core, chief, bulk, generality) |
| factor(noun, portion, section, segment, partition) |
| focus(noun, core, chief, bulk, generality) |
| foundation(noun, base, foot, nadir, basement) |
| fragment(noun, portion, section, segment, partition) |