The Online Lingua Franca-English-Lingua Franca Dictionary offers a useful, searchable vocabulary of one the latest candidates for a universal language.

Based on the Lingua Franca Nova language

Select a letter or type a word and click Find. Searches are automatically wild-carded

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English	Lingua Franca
ugly	fea
umbrella	parapluve
uncle	tio
uncomfortable	noncomoda
uncomfortable --n oncomfortante
unconscious	nonconsensa
uncover	descovrer
undeniable	nonegable
under	su
underline	suliniar
underpants	pantaleta
undershirt	camiseta
understand	comprender
understand, comprehend	comprende
understanding	comprende, comprendia
undesirable	nondesirada
undress	desvestir
uneasy	noncuieta
unequal	nonegal
unfaithful	nonfidel
unfasten	desfisar
unfortunate	nonfortuna
unfortunately	nonfortuna
ungrateful	nongrasiante
unhappy	nonfelis
unique	unica
unit	unia
unitary	simple
unitary, simple	simple
universal	universal
universe	universa
university	universia
unjust	nonjusta
unknown	nonconoseda
unless	sin ce
unlike	no como
untidy	desordinada
until	asta
until now	asta esta ora
until then	asta la ora
up	a supra
upon	supra
upper	plu alta
upset	versar (e.g. a vase), turbar (water, a person)
upstairs	a supra
uranus	urano
urinate	urinar
urine	urina
url	adres de rede
us	nos
use	usa, usar
useful	usable
useless	nonusable
usual	usual
usually	a multe veses
utopia	utopia