Fundamental
Basic and Important (adj.)
Founder
To completely fail (v.)
Disperse
To cause to go in different directions; scatter (v.)
Sparse
Not plentiful; not dense (adj.)
Intersperse
To distribute in between (v.)
Aspersion
Negative remark; slander (n.)
Immerse
To completely cover with liquid (v.)
Submerge
To push under the surface (v.)
Emergent
Just coming into being (adj.)
Refuse
Something discarded; trash (n.)
Fusion
Joining or combination (n.)
Desist
To stop from doing something; cease (v.)
Persistent
Not giving up or stopping (adj.)
Subsist
To support life; to survive (v.)
Preside
To be in charge; govern (v.)
Residual
Left over; remaining (adj.)
Dissident
One who disagrees or argues (n.)
Subsidiary
One that serves or is secondary to another (n.)
Insidious
Spreading harmfully and secretly (adj.)
Assiduous
Determined and constant (adj.)
Supersede
To make useless; to replace (v.)
Sedentary
Not very active; often in a seated position (adj.)