如何在字符串列表中仅获取一个字符串的同义词集？

import nltk
from nltk.corpus import wordnet

def get_synonyms(string, string_list):
    synonyms = []
    for word in nltk.word_tokenize(string):
        for syn in wordnet.synsets(word):
            for lemma in syn.lemmas():
                synonyms.append(lemma.name())
    synonyms = list(set(synonyms))  # 去重
    synonyms = [s.replace('_', ' ') for s in synonyms]  # 去除下划线
    synonyms = [s for s in synonyms if s in string_list]  # 仅保留在列表中的同义词
    return synonyms

string_list = ["apple", "orange", "banana", "fruit"]
string = "apple"

synonyms = get_synonyms(string, string_list)
print(synonyms)