python 3.10
щось таке зробив)
upd: трішки змінив
select_word = ""
text = """
"""
search_word_list = list(select_word)
data_text = text.split()
coincidence_words = []
coincidence_words_nums = []
duralisity = 1.2
while(1):
    procent_coincidence = len(search_word_list) * duralisity #чутливість
    for word in data_text:
        procent_coincidence_to_seach_word = 0
        word_list = list(word)
        for i in range(len(word_list) - 1):
            if word_list[i] == "." or word_list[i] == ",":
                word_list.remove(word_list[i])
        for i in range(len(word_list) - 1):
            if word_list[i] in search_word_list:
                procent_coincidence_to_seach_word += 0.3
            try:
                if word_list[i] == search_word_list[i]:
                    procent_coincidence_to_seach_word += 0.5
            except Exception:
                pass
        if procent_coincidence_to_seach_word > procent_coincidence and procent_coincidence_to_seach_word < procent_coincidence * 1.4:
            if not(word in coincidence_words):
                coincidence_words.append(word)
                if len(word_list) > len(search_word_list):
                    procent_coincidence_to_seach_word -= 2
                procent_coincidence_to_seach_word = round(procent_coincidence_to_seach_word, 0)
                coincidence_words_nums.append(procent_coincidence_to_seach_word)
    
    if len(coincidence_words) < 6:
        duralisity -= 0.1
    else:
        break
max_num = 0
max_num_word = ''
for i in range(len(coincidence_words_nums)-1):
    if max_num < coincidence_words_nums[i]:
        max_num = coincidence_words_nums[i]
        max_num_word = coincidence_words[i]
print(coincidence_words)
print(f"\nyou seach: {select_word}\nmax coincidence word: {max_num_word}")
Результат: 
['symbolically.', 'symbolism', 'symbols,', 'symbols', 'Symbolic', 'symbol']
you seach: symbolize
max coincidence word: symbolism