petrogeny

1. The science of the origin of rocks; theoretical petrography or petrology: a word little used, and bearing the same relation to petrography or petrology which geogeny does to geology.

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Here are some other words you could make with the letters petrogeny

Top Words by points	Points	Word Game
genotype	14	Scrabble

2 Letters	Scrabble® Points
en	2
er	2
et	2
go	3
ne	2
no	2
oe	2
on	2
op	4
or	2
oy	5
pe	4
po	4
re	2
te	2
to	2
ye	5
yo	5

3 Letters	Scrabble® Points
ego	4
eng	4
eon	3
ere	3
erg	4
ern	3
eye	6
gee	4
gen	4
get	4
gey	7
gor	4
got	4
gyp	9
nee	3
neg	4
net	3
nog	4
nor	3
not	3
one	3
ope	5
opt	5
ore	3
org	4
ort	3
pee	5
peg	6
pen	5
per	5
pet	5
pot	5
pro	5
pry	8
pye	8
ree	3
reg	4
rep	5
ret	3
roe	3
rot	3
rye	6
tee	3
teg	4
ten	3
toe	3
tog	4
ton	3
top	5
tor	3
toy	6
try	6
tye	6
yen	6
yep	8
yet	6
yon	6

4 Letters	Scrabble® Points
eery	7
eger	5
ergo	5
erne	4
eyen	7
eyer	7
eyne	7
eyre	7
gene	5
gent	5
goer	5
gone	5
gore	5
gorp	7
gory	8
gree	5
grey	8
grot	5
gyno	8
gypo	10
gyre	8
gyro	8
neep	6
nope	6
note	4
ogee	5
ogre	5
open	6
orgy	8
oyer	7
peen	6
peer	6
pent	6
peon	6
pere	6
pert	6
poet	6
pogy	10
pone	6
pong	7
pony	9
pore	6
porn	6
port	6
pree	6
prey	9
prog	7
pyre	9
pyro	9
reno	4
rent	4
repo	6
rete	4
rope	6
ropy	9
rote	4
ryot	7
teen	4
tern	4
tone	4
tong	5
tony	7
tope	6
tore	4
torn	4
tory	7
tree	4
trey	7
trog	5
trop	6
troy	7
tyee	7
tyer	7
tyne	7
type	9
typo	9
tyre	7
tyro	7
yore	7

5 Letters	Scrabble® Points
egret	6
enter	5
entry	8
ergot	6
genet	6
genre	6
genro	6
goner	6
green	6
greet	6
grope	8
gyron	9
netop	7
noter	5
onery	8
peery	10
pengo	8
peony	10
peter	7
pogey	11
pongy	11
porgy	11
porny	10
preen	7
prone	7
prong	8
rente	5
repeg	8
repot	7
ropey	10
teeny	8
tenge	6
tenor	5
tepoy	10
terne	5
toner	5
toney	8
topee	7
toper	7
toyer	8
treen	5
trone	5
trope	7
yente	8
yogee	9

6 Letters	Scrabble® Points
energy	10
eryngo	10
gentry	10
gerent	7
greeny	10
groyne	10
gyrene	10
opener	8
pereon	8
perogy	12
peyote	11
poetry	11
pongee	9
poteen	8
pyrene	11
pyrone	11
regent	7
reopen	8
repent	8
retype	11
tonger	7

7 Letters	Scrabble® Points
entropy	12
neotype	12
progeny	13
protege	10
pyrogen	13

8 Letters	Scrabble® Points
genotype	14