It is science class, and again your students are using words like yucky, nasty, ugly and smelly to describe an object. Since these are opinions and NOT property words, these words will not work. This four page handout deals with science property words which can easily be copied as a reference guide for your students.
The first page is a chart which can be enlarged and laminated for your classroom. It is a quick reference to aid the students in using correct property words. (I recommend that you copy this page for your students' science folders.)
The next three pages of property words are divided by the five senses, smell, taste, feel, sight, and sound. Other qualitative as well as quantitative property words are included. Non-science property words are also referred to since they are not characteristics of an object. Many times, I also copy these three pages for my students to place in their science folders.
You might also like these science resources:
Science Investigation Rubric for Grades 4-8
Science Investigation Rubric for the Primary Grades