μεγαλ-αυχέω, -ῶ (= μεγάλα αὐχέω) [in LXX: Eze.16:50 (גָּבַהּ), al. ;] to boast great things: Jas.3:5 (Rec. for μεγάλα αὐχεῖ, WH).† (AS)
Thayer:
1) to be grandiloquent 2) to boast great things, to bear one's self loftily in speech or action
μεγαλαυχέω
megalaucheō
meg-al-ow-kheh'-o
From a compound of G3173 and αὐχέω aucheō (to boast; akin to G837 and G2744); to talkbig, that is, begrandiloquent (arrogant, egotistic)
μέγας
megas
meg'-as
Including the prolonged forms, femine μεγάλη megalē , plural μέγάλοι megaloi , etc.; compare also G3176, G3187], big (literally or figuratively, in a very wide application)
KJV Usage: (+ fear) exceedingly, great (-est), high, large, loud, mighty, + (be) sore (afraid), strong, X to years.
G3167 μεγαλεῖοςμεγαλεῖος
megaleios
meg-al-i'-os
From G3173; magnificent, that is, (neuter plural as noun) a conspicuous favor, or (subjectively) perfection
KJV Usage: great things, wonderful works.
G3169 μεγαλοπρεπήςμεγαλοπρεπής
megaloprepēs
meg-al-op-rep-ace'
From G3173 and G4241; befittinggreatness or magnificence (majestic)
KJV Usage: excellent.
G3170 μεγαλύνωμεγαλύνω
megalunō
meg-al-oo'-no
From G3173; to make (or declare) great, that is, increase or (figuratively) extol
KJV Usage: enlarge, magnify, shew great.
G3171 μεγάλωςμεγάλως
megalōs
meg-al'-oce
Adverb from G3173; much
KJV Usage: greatly.
G3172 μεγαλωσύνημεγαλωσύνη
megalōsunē
meg-al-o-soo'-nay
From G3173; greatness, that is, (figuratively) divinity (often God himself)
KJV Usage: majesty.
G3174 μέγεθοςμέγεθος
megethos
meg'-eth-os
From G3173; magnitude (figuratively)
KJV Usage: greatness.
G3176 μέγιστοςμέγιστος
megistos
meg'-is-tos
Superlative of G3173; greatest or verygreat
KJV Usage: exceeding great.
G3187 μείζωνμείζων
meizōn
mide'-zone
Irregular comparative of G3173; larger (literally or figuratively, specifically in age)
KJV Usage: elder, greater (-est), more.
G3372 μῆκοςμῆκος
mēkos
may'-kos
Probably akin to G3173; length (literally or figuratively)
καυχάομαι
kauchaomai
kow-khah'-om-ahee
From some (obsolete) base akin to that of αὐχέω aucheō (to boast) and G2172; to vaunt (in a good or a bad sense)
KJV Usage: (make) boast, glory, joy, rejoice.
G2620 κατακαυχάομαικατακαυχάομαι
katakauchaomai
kat-ak-ow-khah'-om-ahee
From G2596 and G2744; to exultagainst (that is, over)