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Category 1
Category 2
Category 3
Category 4
Category 5
100
An animal or plant that lives in or on a host
Parasite
100
Lacking any definite plan or order or purpose
Random
100
A poisonous substance produced organically
Toxin
100
The branch of biology that studies animals
Zoology
100
Anything that disturbs, endangers life, or is offensive
Nuisance
200
A practical method or art applied to some particular task
Technique
200
An elaborate and systematic plan of action
Strategy
200
Period of European history at the close of the Middle Ages
Renaissance
200
The principal character in a work of fiction
Protagonist
200
A prescribed number
Quota
300
Greatly exceeding bounds of reason or moderation
Outrageous
300
An immense cloud of gas and dust in interstellar space
Nebula
300
Tissue that conducts synthesized food substances (e.g., from leaves) to parts where needed; consists primarily of sieve tubes
Phloem
300
State of uncertainty in a choice between unfavorable options
Quandary
300
Freedom from activity
Repose
400
A filled-in drawing of the outline of an object
Silhouette
400
A broad range of related objects or values or qualities
Spectrum
400
A state of commotion and noise and confusion
Tumult
400
Having wavelengths shorter than light but longer than X-rays
Ultraviolet
400
Move in a wavy pattern or with a rising and falling motion
Undulate
500
The relation between two interdependent species of organisms
Symbiosis
500
Deserving or inciting pity
Wretched
500
The woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vessels
Xylem
500
Someone who is dazzlingly skilled in any field
Virtuoso
500
To be undecided about something
Vascilate