ἀκρο-γωνιαῖος, -αία, -αῖον (< ἄκροι, γωνία, an angle) [in LXX: Isa.28:16 (פִּנָּה) * ;] = Attic γωνιαῖος (freq. in Inscr.; MM, VGT, see word ἀ.), at the extreme angle: ὁ ἀ., the corner foundation stone, Refs Eph.2:20, 1Pe.2:6.† (AS)
Thayer:
1) placed at an extreme corner, the corner foundation stone
ἀκρογωνιαῖος
akrogōniaios
ak-rog-o-nee-ah'-yos
From G206 and G1137; belonging to the extreme corner
ἄκρον
akron
ak'-ron
Neuter of an adjective probably akin to the base of G188; the extremity
KJV Usage: one end . . . other, tip, top, uttermost part.
G196 ἀκριβέστατοςἀκριβέστατος
akribestatos
ak-ree-bes'-ta-tos
Superlative of ἀκριβης akribēs (a derivative of the same as G206); mostexact
KJV Usage: most straitest.
G200 ἀκρίςἀκρίς
akris
ak-rece'
Apparently from the same as G206; a locust (as pointed, or as lighting on the top of vegetation)
KJV Usage: locust.
G203 ἀκροβυστίαἀκροβυστία
akrobustia
ak-rob-oos-tee'-ah
From G206 and probably a modified form of πόσθη posthē (the penis or male sexual organ); the prepuce; by implication an uncircumcised (that is, gentile, figuratively unregenerate) state or person
KJV Usage: not circumcised, uncircumcised [with G2192], uncircumcision.
G205 ἀκροθίνιονἀκροθίνιον
akrothinion
ak-roth-in'-ee-on
From G206 and θίς this (a heap); properly (in the plural) the topoftheheap, that is, (by implication) bestofthebooty
KJV Usage: spoils.
G891 ἄχρι, ἄχριςἄχρι, ἄχρις
achri achris
akh'-ree,akh'-rece
Akin to G206 (through the idea of a terminus); (of time) until or (of place) upto
KJV Usage: as far as, for, in (-to), till, (even, un-) to, until, while.