"issue" when you mean "problem"
"disturbed" when you mean "psychotic"
"sanitary engineer" when you mean "janitor"
"unusual" when you mean "bizarre"
"ample" or "horizontally endowed" when you mean "fat"
"challenged" when you mean "crippled" or "retarded" or "short" or "clueless"
"differently abled" when you mean "disabled"
"ill" when you mean "drunk"
"vertically challenged" when you mean "midget"
The key is that the words themselves are not inherently a euphemism. It's their use in place of something else that you don't want to say that makes them euphemistic. A euphemistic expression can have a perfectly normal, literal, unquestionable meaning. It becomes a euphemism when you are using it as a "nicer" way of saying something.
A euphemism for fat is "pleasingly plump". A euphemism for feeling sick is feeling "under the weather". A euphemism for being fired is being "laid off".
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Chairperson
Examples of nouns that do not change form for singular to plural:advicedeerbinocularsmeansoffspringpantssalmonscissorssheepspeciesswinetrout
Some examples of words using the root of spiritusare; spirit, inspire, inspiration, spirited, spiritual and many others.
A euphemism for fat is "pleasingly plump". A euphemism for feeling sick is feeling "under the weather". A euphemism for being fired is being "laid off".
Some examples of transitional words used to contrast statements are:butoryetstillratherthoughinsteadhoweverotherwiseconverselyalternativelynonethelessneverthelessnotwithstanding
Euclid, euclidean, Europe, European, euphemism, euphemistic, euphoria, euphoric, euthanasia, Eustachian tube
Examples of one syllable words are:aanareboarboreboxcancarcaredodogdoordougheatedgeeighteyefiveforfourgivegogoathihighheightinisitjayjokejoykeepkingkneelatelightlotmemoonmynonotnoteofoneownpoorpotpourquestquitquiteratrestrootroutesinsomesongthrowtotootoottwousevieviewwhatwhenwhoyearyetyouzipzonezoo
Some examples of words with complex syllables in English are "antidisestablishmentarianism," "supercalifragilisticexpialidocious," and "pseudopseudohypoparathyroidism."
Euphemistic
Frugal
Some examples of words with a soft vowel sound are "gentle," "whisper," "cuddle," and "delicate."
You will find some examples in the Wikipedia article on "Polish language".
potato dealer
euphemism
Some examples of words with the suffix -sion are discussion, decision, and expression.