Sharks, Scimitar-horned oryx sharks
and stegasaurus
· Barracuda · Big Mouth Bass · Blowfish · Bonefish
tennis
zoroastrian
questionableness
Beech.
How about "kaleidoscopic"? Kinesthesiologist.
waspxyleborus (a big bark beetle),
· unpredictable
bacteriologistbacteriotherapeuticballistocardiographbaresthesiometerbarocyclonometerbarothermohygrographbasicytoparaplastinbatrachomyomachybeautificationbenzalphenylhydrazonebenzofuroquinoxalinebenzophenanthrazinebenzophenanthrolinebenzophloroglucinolbenzoxyphenanthrenebioastronauticalbioclimatologiesbiodegradabilitybioelectricitiesbioenvironmentalbiologicohumanisticbioluminescencebiorhythmicitiesbiotechnologicalbipotentialitiesblabbermouthblepharoblennorrheablepharochromidrosisblepharoconjunctivitisblepharohematidrosisblepharosphincterectomyblepharosyndesmitisbloodhoundbloodthirstinessboroughmongeringbougainvilleabouillabaissebourgeoisiebrachiofaciolingualbrachycatalecticbrachycephalizationbronchoaspergillosisbronchoconstrictionbronchoesophagoscopybronchomucormycosisbronchopneumoniabronchopulmonarybureaucraticallybutterscotchBusinesslike, bloodthirstiness and bibliographically are big words.
good-looking, graceful, gorgeous
Big is an adjective. Words that modify adjectives are called adverbs. Really is an adverb that can modify big.
Animals beginning with the letter O:OcelotOctopusOkapi (antelope)OlingoOlive WarblerOlmOnagerOpossumOrangutanOrcaOrioleOropendolaOryxOspreyOstracodOstrichOtterOvenbirdOwlOx, OxenOxpeckerOysterOystercatchersOzark big-eared batanimals starting with O: * owl * ocelot * ostrich * ox * otterorangutang, ocelot, orca whale, octopus, ogopogo (?)OcelotOctopusOkapi (antelope)olingoOlmOnagerOpossumOrangutanOrcaOrioleOropendolaOropendulaOryxOspreyOstracodOstrichOtterOvenbirdOwlOxOxenOxpeckerOysterOzark big-eared batOtter· Octopus · Opossum· Orangutan· Ostrich· Otter· Owl· OxotterosterichospreyowlopossumoxOxen, Owl, Octopus