Chairperson
Chairmen
kjkjk
Examples of nouns that do not change form for singular to plural:advicedeerbinocularsmeansoffspringpantssalmonscissorssheepspeciesswinetrout
If by 'invisible' you mean abstract nouns, words for things that can't be seen, heard, smelled, tasted, or touched, some examples are:attitudebeautycaredestinyeducationfriendshipgratitudehopeideajokekindnesslovemysteryneedopinionpeacequestreasonseasontrusturgevalueworryyearzeal
Some examples of words using the root of spiritusare; spirit, inspire, inspiration, spirited, spiritual and many others.
Some examples are reduce, deduce, and produce(...) :) hope this helped
Civilization Revolution :)
Some examples of transitional words used to contrast statements are:butoryetstillratherthoughinsteadhoweverotherwiseconverselyalternativelynonethelessneverthelessnotwithstanding
Examples of one syllable words are:aanareboarboreboxcancarcaredodogdoordougheatedgeeighteyefiveforfourgivegogoathihighheightinisitjayjokejoykeepkingkneelatelightlotmemoonmynonotnoteofoneownpoorpotpourquestquitquiteratrestrootroutesinsomesongthrowtotootoottwousevieviewwhatwhenwhoyearyetyouzipzonezoo
Some examples of schwa words include banana, sofa, pencil, and elephant. The schwa sound is often represented by the unstressed vowel sound in syllables of longer words.
You will find some examples in the Wikipedia article on "Polish language".
kjkjk
hoe
Chairperson
tomato
Some examples of pronouns are "he", "she", "it", "they", "we", "you", "I", "myself", "mine", "her", "his", "ours", "yours".
Some examples of unfamiliar words are frond, pax, specious, and obdurate. Sinecure and retinue are two other words that aren't used commonly.
Some examples of 3-syllable words beginning with "p" are: potential, picturesque, and peculiar.