The process of reducing a word's value to a single digit involves adding the individual digits corresponding to the letters in the word, until a final reduced number between 1 and 9 is obtained. However, if the resulting number is 11, 22, 33, or 44, it is considered a unique number and will not be reduced any further.
For instance, the value of 728 is 17, which is then reduced to 8, while 911 is reduced to 11 and not to 2. Similarly, the human body temperature of 37°C can be reduced to 10 (symbolizing perfection), and then further to 1 (representing new beginnings or the divine).
The use of simple numerology based on the number 9 suggests a possible commonality between the words, such as lung (180 ריאה), nose (81 אף), nature (81 טבע), face (180 פנים), and eyes (180 עינים). However, it should be noted that this approach is not scientifically rigorous enough to establish a high degree of probability.