By matching the spectra of the unknown substance with those of known substance, scientists can identify the element or composition of the substance.
absent
active
acceptable
academic
abnormal
abstract
abundant
absolute
addicted
accessible
acute
adequate
agile
aesthetic
aggressive
alert
afraid
agricultural
alive
aloof
angry
anonymous
annual
ambitious
ambiguous
ample
amber
appropriate
applied
available
artistic
automatic
awake
attractive
asleep
ashamed
astonishing
assertive
artificial
archaeological
arrogant
arbitrary
awful
awkward
bare
bald
balanced
basic
bad
aware
bloody
blonde
broken
brave
black
blind
bold
certain
busy
capable
clear
civilian
civic
chronic
clean
classical
closed
colorful
comprehensive
complete
hacksaw
hairbreadth
haircloth
hairdo
haddock
hairbrush
haircut
gunsmith
gunman
hailstone
guncotton
gunshot
guttersnipe
gunlock
gunpowder
hairline
hairdresser
gunfire
hairsplitting
hairpin
hairsbreadth
hairspring
gumshoe
gunboat
guidebook
guidepost
guideline
guesswork
grubstake
gumdrop
guardhouse
guardsman
greenhouse
grassroots
greyhound
grindstone
grillroom
greenwood
greenhorn
gravestone
graveyard
greenback
griddlecake
gridiron
grubstake
groundwork
grasshopper
grapeshot
grandpa
grapevine
grandparent
grapefruit
grandstand
grandchild
grandfather
goldfish
gooseberry
granddaughter
grandma
grandson
gangway
gemstone
forethought