protoplanet

noun 0.719

protostar

noun 0.655

protome

noun 0.578

protoplanetary disk

noun 0.573

proton

noun 0.572

sun

noun 0.566

protoporphyrin

noun 0.563

protomer

noun 0.562

prototype

noun 0.557

primus

noun 0.546

protocell

noun 0.545

protoplasm

noun 0.539

planetesimal

noun 0.539

protium

noun 0.538

primordial

noun 0.535

protoporphyria

noun 0.529

primogenitor

noun 0.528

progenitor

noun 0.527

primosome

noun 0.524

prepositive

noun 0.522

protostome

noun 0.520

proteus

noun 0.519

inner planet

noun 0.518

protist

noun 0.516

proto-language

noun 0.514

protomartyr

noun 0.514

protocone

noun 0.513

prepositus

noun 0.510

precursor

noun 0.508