Longer, hard to read words often have more syllables than simpler, easier to read words. In fact, average word syllable count is one of the variables in both the Flesch reading ease and Flesch–Kincaid grade level readability metrics.
A 1995 study found that junior high school students were able to recognize between 10,000-12,000 words, whereas college students were able to recognize between 12,000-17,000 words.
While, which 10,000-12,000 words vary based on the individual, we can make assumptions about the recognizability of a word based on how common the word is. The more common a word is, the more likely an individual is to have been exposed to it, and thus the more likely that individual would be to recognize and understand the word. The Rare Scale is a linear scale based on word ranks from 10,000 - 20,000. A word with rank at or below 10,000 would be a 0% (thus considered common) on the rare scale, and a word with rank at or above 20,000 would be a 100% (thus considered rare) on the rare scale.
The Rare Scale is meant to be a guide to identify possible problem words. Keep in mind common words may still be problematic as they may have an unusual definition in certain context. Such definitions may be less recognizable and thus capable of confusing the reader. On the other hand domain specific jargon can be both rare in general, and easily understood by a well versed audience on the given topic. Nevertheless, commonality is a reasonable approximation for how well a word may be understood by the general population.
 E.B. Zechmeister, A.M. Chronis, W.L. Cull, C.A. D'Anna and N.A. Healy, Growth of a functionally important lexicon, Journal of Reading Behavior, 1995, 27(2), 201-212
While they're is nothing inharently wrong with adverbs, they often overused and unnecessary. Adding additional unecessary words to a passage increases the passage length and can make a document harder to read.
Hedge words are mitigating words that can show uncertainty, such as 'can', 'may' and 'indicates'. They are common used to take a less harsh stance and are frequently found in the scientific literature. Multiple hedgewords are redundant, adding unnecessary length. As a general rule, a sentence should not have more than one hedge word. If hedging against two or more separate ideas in the same sentence, consider splitting the sentence.
The readability analyzer takes a sample of writing and estimates the readability based Flesch Reading Ease, Fog Scale Level, and Flesch-Kincaid Grade Level metrics
Sentences with passive voice construction tends to contain extra words when compared to its active voice counterpart. Use Passive Voice Detector to find these overly wordy sentences.
The difficult & extraneous word finder helps you write clearly and concisely by identifying possible weak points in your prose, such as difficult words, adverbs and multiple hedge words.
Difficult words may alienate or confuse readers who are not familiar with them. Article writers, and children's authors in particular may want to pay close attention to word choices. The "Complex Words" and "Rare Words" tab can help you identify any words that may not be appropriate for your audience.
When writing fiction it's generally advised to limit adverbs, as many adverb + verb combinations can be replaced by a better, more descriptive verb. Check the "Adverbs" tab to find any adverbs that may have slipped through unnoticed.
Non-fiction, and scientific writers will want to pay attention to the number of hedge words used per claim. Hedge words are mitigating words that can show uncertainty, such as 'can', 'may' and 'indicates'. Multiple hedge words are redundant, may a passage unnecessarily wordy, and can convey the author is unsure of him or herself. The "Hedge Words" tab can help you find sentences with multiple hedge word groupings.
The Difficult & Extraneous Word Finder may warn you about words and phrases you wish to keep. Simply click on the word in the corresponding tab to dismiss the warning.Resources utilized by the Difficult & Extraneous Word Finder