firstborn

noun 0.787

firstfruit

noun 0.719

lastborn

noun 0.643

primogenitor

noun 0.625

primogeniture

noun 0.614

first

noun 0.603

yearling

noun 0.602

eldest

noun 0.585

primus

noun 0.582

secondborn

noun 0.571

primeur

noun 0.561

first fiddle

noun 0.557

first thing

noun 0.549

youngling

noun 0.546

only child

noun 0.546

baby of the family

noun 0.545

primigravid

noun 0.538

single child

noun 0.536

first blood

noun 0.536

fatling

noun 0.535

first-timer

noun 0.535

youngest

noun 0.529

primo

noun 0.527

first name

noun 0.524

first string

noun 0.523

primipara

noun 0.523

oldest

noun 0.518

primero

noun 0.518

number one

noun 0.516

primal

noun 0.515

sweetling

noun 0.511

first night

noun 0.510

princeps

noun 0.510

pick of the litter

noun 0.509

first language

noun 0.508

numero uno

noun 0.506

foal

noun 0.505