CRT spot
DM display
Doppler signal
IF signal
IM display
RF echoes
accord
acknowledge
acknowledgment
act like
action and reaction
adopt
adumbration
affect
agree
agree in opinion
agree with
answer
answer back
answering
antiphon
antiphonal chanting
antiphony
ape
assume
automatic reaction
autonomic reaction
back answer
back talk
backchat
be affected
be in tune
be inspired
be involved
be moved
be reflected
be sent back
beam
beat signal
blips
boom
booming
borrow
bounce back
bounceback
bounces
care about
caring
catch the flame
echoes
analog
analogue
imitation
nymph
parallel
reflection
reflectivity
reflexion
resemble
echoed
echoing
echos
blast
burst
chorus
impression
laugh
melody
memory
roar
rumble
rush
sigh
sound
strain
thunder
tone
wail
whisper
Eco
Greco
deco
eco
gecko
gekko
grecco
greco
hecco