- animals
- mammals
- insects
- fish
- reptiles
- amphibians
- australian animals
- african animals
- food
- fruit
- meal
- snack
- dessert
- ingredient
- crop
- commodity
- can be an adjective (for code name purposes)
- color
- gem
- mood
- superlative
- chronological components
- monday...
- september...
- medieval, renaisance, bronze-age, (epochs), future,
- horroscopes (zodiac, chinese)
- "foreign"
- greek letters
- languages
- countries
- english villages
- cities
- rivers/water bodies
- modification functions
(e.g. reverse, syllable swaps, vowel shifting (a-e, e-i, i-o, o-u, u-a, etc.), minimal letter replacement, add short prefix like 'o', 'a', 'y', drop some vowels...)
- major suffixes/prefixes
- anatomy
- occupations
- country
- elements
- chemical compounds
- technology/inventions
- e.g. radar, microwave
- household items
- places e.g. church museum zoo post-office
- mythological
- beasts
- heroes
- places
- weapons
- games
- philosophy/logic/mathematical terms of art