It is not the function or focus of scientists to say everything so that everyone can understand them. Many disciplines of many different kinds have specialized vocabularies to help simplify and expedite communication among members of the specialized groups.
things that you could do
Special.
Yes, "special-needs" is a hyphenated adjective. The two words do not separately modify the subject.
Probably a, an and and.
The adjective form of the noun celebration is celebratory.The participles of the verb celebrate can also be adjectives: celebrating or celebrated.
Scientists may use different words than common people.Special terminology proficiency, when used correctly, shows that the speaker is competent in the field and belongs to the trustworthy community of experts. To make things simpler, for informality between themselves and for fun, experts invent their own jargon. This is not just scientists but in all groups of people.
There are many scientific words and phrases that have been agreed on to mean specific things over time by the scientific community. Using those words (correctly) removes the need to ask for clarification in papers, etc. and/or to debate them later.
Special
That could be unusual, unique and exceptional
things that you could do
A lot of words could fit here, but I think the one you're looking for is analyze.
Some words that mean the same thing as less common could be irregular. Out of the ordinary, different, insignificant, recessive, these could also work.
Scientists is a common noun. Proper nouns are the unique names of people, places, or things. Common nouns are the words for general things. If a common noun is part of a name, it becomes a proper noun. Pronouns always replace proper and common nouns.
You could tell a person how special and beautiful they are to win their heart. You could also say that you love them. Actions should be accompanied with words to win someone's heart.
They are all homophones. Each word by pronunciation only could be numbers.for, fore could be four -- 4to or too could be two -- 2ate could be eight -- 8won could be one -- 1
I could speculate that those would be special words, but only if I wore my spectacles, and maybe looked into this with my speculum- but a question of this type is rather specious. Get thee to a dictionary!
Some words could be: unusual, bizarre, strange, curious