fundamental (n.)
- abecedarian
- aboriginal
- axiom
- base
- basement
- basic
- basis
- bed
- bedding
- bedrock
- beginning
- bottom
- budding
- cardinal
- center
- central
- climax
- component
- constituent
- constitutional
- core
- cornerstone
- crisis
- crux
- dominant
- element
- elements
- elixir
- essence
- essential
- factor
- first
- floor
- flooring
- flower
- focus
- footing
- formative
- foundation
- frequency
- fundament
- germinal
- gist
- grammar
- ground
- grounds
- groundwork
- gut
- hardpan
- harmonic
- heart
- homespun
- hypostasis
- inaugural
- inchoative
- infant
- initial
- initiative
- intonation
- issue
- kernel
- keystone
- landmark
- law
- main
- marrow
- material
- meat
- mere
- milestone
- monotone
- monotony
- natal
- necessary
- nub
- nucleus
- organic
- original
- overtone
- partial
- pavement
- pitch
- pith
- pivot
- plain
- postulate
- primary
- prime
- primitive
- principal
- principle
- principles
- pure
- quid
- quiddity
- quintessence
- radical
- requisite
- rudiment
- rudiments
- rule
- sap
- seat
- sill
- simple
- single
- soul
- spare
- spirit
- stuff
- substance
- substantive
- substratum
- substructure
- theorem
- tone
- undercarriage
- understructure
- uniform
- ur
- vital
fundamental (adj.)
- abecedarian
- aboriginal
- antenatal
- austere
- autochthonous
- bare
- basal
- base
- basic
- basilar
- bed
- beginning
- bottom
- budding
- cardinal
- center
- central
- chaste
- constituent
- constitutional
- constitutive
- core
- creative
- critical
- crucial
- dominant
- elemental
- elementary
- embryonic
- essence
- essential
- fetal
- first
- floor
- focal
- fond
- formative
- generative
- genetic
- germinal
- ground
- harmonic
- heart
- homely
- homespun
- homogeneous
- important
- inaugural
- inceptive
- inchoate
- inchoative
- incipient
- indispensable
- indivisible
- infantile
- inherent
- initial
- initiative
- initiatory
- intrinsic
- introductory
- inventive
- irreducible
- law
- life-and-death
- life-or-death
- main
- material
- mere
- monolithic
- monotone
- nascent
- natal
- necessary
- needful
- nub
- organic
- original
- paramount
- partial
- parturient
- plain
- postnatal
- pregnant
- prenatal
- primal
- primary
- prime
- primeval
- primitive
- primordial
- principal
- pristine
- procreative
- pure
- quid
- quintessential
- radical
- requisite
- rudimentary
- seminal
- severe
- simple
- single
- spare
- stark
- substantial
- substantive
- tone
- unadorned
- uncluttered
- underlying
- undifferentiated
- uniform
- ur
- vital
